My girlfriend cheated on me, twice, with her ex. I still love her incredibly, but don't know what to do.

protector21
My girlfriend and I have been together for about 7 months now, and we really connected early and quickly. She has depression, which is a constant battle, and it also has twists. She moved into an apartment with her best friend, for college, and I live a town away. This condition she has makes life hard, so I gladly help out whenever I visit. (washing dishes, doing laundry, making sure she goes to class, etc.) One night, after a little bit of partying together, she and I are having quiet time in the living room, and after a while, she admits to cheating on me, twice, with her ex. Once, when we had started out, and the second time, during the first two weeks of her living in a new place. After 5 months together. She told me her depression makes her think bad things, and want to make herself miserable, which I believe. I've been helping her for a while, I recognize what she says to be true. However, I'm heartbroken that it had to be what I feared most. Now, this guy has not been kind through all this. When we were together in the beginning, he was harassing her, (texts) and I was set to handle it, but she asked me not to. I complied, and this happens. Still I'm asked to do nothing. The only thing I'm concerned about is the future. My question isn't what to do with the ex. It's what should I do about myself, and this situation?
Updates
+1 y
I appreciate the feedback, but I'm not sure I gave enough information: She does have medication, and I do feel very strongly for her, despite what's happened. I trust her, my biggest issue is the ex. Also, the meds affect our sex life.
Updates
+1 y
We're not together anymore. I appreciate everyone's input and support. I'm hurting a lot, but on the bright side, I'm single again. New women to look forward to.
My girlfriend cheated on me, twice, with her ex. I still love her incredibly, but don't know what to do.
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