Seeing one of Osamenor's posts inspired me to do this topic for both learning purposes and personal ones.
She mentioned that whenever she sees someone struggling with personal relationships, it's usually the person not going about right with the 7th house. At least that's what I got.
That, or being genuinely challenged by the seventh house. Especially if you have planets there, it might be a matter of integrating their energies. Since you have Chiron solidly in H7 and Mars conjunct your DC, you've got some planetary challenges, and working with them could be a lifetime endeavor.
Also not sure which housing system to use, but I resonate more with equal or whole sign.
Whichever one resonates most for you, that's what you should use.
Long story short, I had only one mildly serious relationship when i was 19. We dated for 1.6 y and lived together, until the relationship became toxic and overbearing. Ever since that I've always fallen for someone who is somewhat unavailable. Mostly people away from me, foreigners or just not local. I have zero luck with relationships lol.
Personally, IMO, going for unavailable partners just means that you're not ready yet. You wish to still practice. Nothing wrong with that while you are figuring things out.
I like StillOne's interpretation a lot. To that, I would add that I see self protectiveness in your chart. If you've had an abusive relationship, it's only natural to be afraid of getting into another. This may be a deeply unconscious fear, but I suspect it's the main thing driving you to unavailable people.
Saturn on the ascendant gives you a self protective cover. Saturn is great at drawing boundaries. On the ascendant, it gives you great capability to draw boundaries, and perhaps a tendency to draw them too tightly, especially if you've had your boundaries violated. In escapist Pisces, though, we have a combination of boundaries and a tendency to just go away. Put them together, and it looks like your way of handling something like this is to be closed off and not present. Which is a very natural and common way for people to handle anything traumatic, but it's especially pronounced in your ascendant placement.
Mars at the DC gives you another kind of self protection. You could easily push people away, if you want to. Virgo is also a sign with a certain emotional detachment: the ability to just focus on whatever you're doing and not be swayed by any drama or emotions going on around you.
I also find Mars on the DC to be a real double edged sword. It's an angular placement, which makes Mars one of your strongest energies, but the DC/seventh house is also indicative of what we disown in ourselves and project onto others, especially partners. Whatever qualities you disown, you draw people into your life who show them to you. If the disowned planet is Mars, you're bound to get a partner who shows you Mars in a truly horrific way.
If you have Mars more integrated in yourself, then you can handle its energy in a partner, because you know how to handle it in you. At that point, you're more likely to find partners who manifest a healthy Mars: assertive, passionate, maybe competitive, but not violent or abusive. And you're able to meet them with your own assertiveness and passion.