<human>: Provide a brief overview of the text.

My girlfriend and I started dating about 6 months ago. She has a ton of issues with clinical depression and we sort of mutually broke up: I did the actual breakup after she had hinted that she didn't know if the relationship was a good idea. I think I could have salvaged it had I stuck it out for a couple days but I cut things off pretty directly, told her I was done and we didn't speak for a few days. We cycled through a couple times where we would talk for a bit on friendly terms and then I would cut contact again. It was an emotional rollercoaster for both of us.

After about 4 weeks of this we reconciled and confessed that we still loved each other. She's started seeing a therapist. We hung out a few times and decided to get back together.

Then I asked if anything had happened while we were broken up. She initially said no but soon caved and told me she got very drunk with an ex and briefly had sex with him while we were in the first non-speaking period. I requested the full story and she said he invited her for drinks, she went with, he invited her back to his place where he gave her a lot more alcohol and then made his move. Apparently they had very brief sex but she quickly stopped him and went home crying because she felt awful about it.

I do believe this story. I've become pretty good friends with her older sister who I trust and she seems to believe the story too. My girlfriend feels genuinely terrible for what she did and we were not together when it happened. I do love this girl but I had told her when we broke up I would only consider getting back together if we didn't see other people during the off time.

Should I consider forgiving her? She's begging me to forgive her and I know this wouldn't have happened if we had been together at the time.
<bot>: Should I forgive my (sort of currently ex) girlfriend for having brief drunk sex with an ex while we were broken up?