Hi, Steph--
As to whether you should let go or hang onto your relationship, if you're stuck on the roller coaster.... no matter how much you love this person, if it's taking a big, big toll on your self-esteem, or if you know in your heart the two of you are mismatched, then you might just feel a sense of relief if you let go and walk on. Don't you deserve someone who doesn't jerk you around like this?
With Saturn opposite your 12th house Venus-Chiron, I think as a child you suffered quite a bit from feeling that your Dad didn't love you. Saturn now transiting your 4th house is consistent with your Dad back in your life. You probably have a strong idea now whether Dad is trying to make amends as a positive force in your life. I think the best option would be to meet for some family counseling sessions, where you're not just trying to wing what to do about such a momentous relationship at a vulnerable time in your life.
Jupiter is the traditional ruler of your natal 7th house, as well as of 4th house of early childhood conditioning and one's father. Square Neptune, you may have an inherently hopeful view on family and love, but find that the realities don't live up to your expectations. I have Jupiter square Neptune, as well, and find that adopting a more spiritual view of life is helpful.
Transiting Uranus and Pluto are messing with your second house of money. However, you do have some indications difficulties in being realistic about money (that Jupiter-Neptune joined by Mars, moon, and Uranus; ruler of the 2nd house in the 12th.) If you are able to rid yourself now of any surplus expenses or debts, and start budgeting frugally and cautiously, that should help.
When will things get better? The universe notices when we take small steps to help ourselves. With sun trine Neptune, you might start with some creative visualization with Saturn trining your second house planets, you do have the capacity for financial self-discipline.
With that lovely Venus-moon sextile, you have the capacity for a lot of love, for anyone receptive enough to know how to accept it.
Steph, I could track some beneficial transits for you, but so often these are followed by or mixed with less possitive ones. So rather than expecting the universe to align externally to make our lives happier, as Samantha noted, it's best to learn how to see yourself as a capable person able to weather the hard times and to emerge stronger for them.