Hi Maria.
I'm thinking being comfortable around unavailable men is related to your aquarius 7th house moon. An air moon, like aquarius can be emotionally cool, or aloof. The moons placement in your 7th having to do with partnerships will bring in such sorts.
Interestingly,
On the other hand, you have a scorpio stellium in the 4th house. Sun rules your ascendant with ruler(sun) in the 4th. I have no doubt you are a deeply loving, intense person.
But the aqua moon, is so opposite of that energy. Quite a polarity in your own nature, and this gets manifested in your relationships. Since so much of what we attract in our lives is a manifestation of our own natures/ or energies we are not acknowledging in ourselves. Doing internal work, getting to a place of self love will do wonders in the types of people that enter our lives. The law of attraction and whatnot.
Right now, saturn is transiting your 5th house. So in general this is not the best time for dating. As saturn is about limits/restrictions/lessons learned/maturation in the house that it is transiting. Depressed feelings regarding romance are very common during saturns transit of the 5th. Saturn transits to a house are about 2 years in length. But it's a great time to do work with regard to romance, children, creativity, activities/hobbies you enjoy.
As for trust issues. Trust should definitely be earned, not given out freely. I am sure you will find that right person for you, who will earn your trust, and you can let go of some of your defenses. Love is often about allowing yourself to be vunerable afterall, as I am sure you know. It's very possible that when saturn transits your 7th house which is some years away still that someone special will enter your life.
So there is that. You're just doing the work now required for that.
I hope that helps some.