Ahoy there, Astromeg:
Wow. That's a busy chart. I hope you don't mind, but I am going to ignore the asteroids because I have found that they do not add much to the chart and have the tendency to lead a person astray when interpreting.
You're chart is kind of funky. Your Midheaven is all the way in the eleventh house because you used the sign house system (aka Vedic, aka whole sign). Because of this I am going to start with just a general overlook of your chart, and then I'll get into the question. Luckily, you have already provided some information about your relationships, so I will use that as a spring board.
You have Venus in the first house, which so often makes a person attractive, and if not a celluloid beauty, certainly someone whom people are drawn to. You have a late ascendant, in the bounds of the more difficult planets (in some systems), and you're chart ruler is Saturn. This tells me that there is a certain austerity to your personality, somewhat of a monkish person, which is not to imply that you are prude but that there is a reserve, a reticence. This is compounded by the affliction of your lights by Saturn. The Moon conjoined to Saturn at your birth, though out-of-sign, in the sign of Virgo, has a crushing effect on your emotional well-being, and it is in a quadrate relationship to your Sun in the twelfth house. (Some might not interpret Saturn afflicting your Moon because of the sign-house system, but I do.) This tells me that you have a tendency toward feeling sad and down and that you are critical of yourself. You are a bit of a loner, and you have a hurt ego. As this relates to relationships, having a hurt ego attracts people of like kind, sometimes those who will take advantage of a person in such a state as a shark takes advantage of a bleeding, injured seal.
You have Neptune conjoined the Sun by less than a degree in the twelfth house. How nice.
There is an inclination toward the mystical, the spiritual, though, often, the constitution is made weak by such a contact, especially with Saturn elevated and contact your horoscope. You are probably prone to illness (colds, flews, etc.) There is a yearning for more, however. With Jupiter in your ninth house with the North node, you will seek that which is greater, some form a greater understanding, perhaps in college, but with the mystical element strong, I would say this is more toward religion or some mystical practice. Actually, you have a partile conjunction with Mars, a positive expansion of the Martian energy, which often leads to sport or something competitive. With your part of fortune in the eleventh house of the masses, and with derived houses, we look to the eighth house, the solar eighth here. Although the eighth is regarded as the house of death, I term it the spiritual house because it bridges life with death (and it is only an illusion that the two are separate). So you are successful through the masses, interacting with many, in a spiritual way. And if we look to the ninth, we can see how you do this, which is that of the higher purpose, with education, learning. Perhaps you teach some mystical art or, if not that, then by means of health care, like a physical therapist or a energy healer, since there is that incline. Since Virgo, the zodiacal sign of healing is there, it must be by some means of healing people.
All of what I said shows that you are a good person, in all likelihood—a person with a huge heart. Unfortunately, your Venus is not in the best of states, but in the earth sign of Capricorn, it could certainly do worse. Love is expressed quite physically for you, as it is disposited from Virgo, another earth sign. I can also see that you can curl up and retreat very easily when you have been hurt.
Harmonically, Pluto forms a fourth harmonic aspect to your Venus, agitating it, maligning it. It can create self-centered relationships. From a traditional approach, you have Saturn, Jupiter and Mars witnessing it. This too is not so helpful, having the malefic planets looking so at your Venus. I suppose this is why you have had so much trouble of late. Saturn is witnessing, dispositing your Venus; it is conjoined to the ruler of your house of marriage, and it forms a dissonant aspect to your Sun. Either way, you have a challenged love life, so it seems.
You will certainly have a delay in marriage, and, worse case scenario, you might never marry. I do not think that will happen, but I can see that it will definitely be delayed.
I don't know what it is about today, but a lot of the charts I have looked at by those experiencing difficult relationships have very similar astrological situations.
Here's the hard part, Astromeg, coming up with a solution. I can see that there are two types of men that you might attract, the controlling type or the egoistically, arrogant type. But it need not be that way. You can find someone who is supportive, that gives you structure and who might be a very generous sort, funny and outgoing. My usual advice is to work on chaining your thoughts. I imagine that you are thinking of the negative past relationships. Maybe build a vision board of the qualities that you would like and ruminate on that.
I hope this helps.
P.S. I think because you are a very spiritual person that you will be able to change this trend. No one with the Sun and Neptune like that can not be spiritual. And be careful and stay away from drinking and intoxicants. It will really hurt you physically and psychically, and you might be prone to addiction, especially with the blue moods you can get into.