I apologise for the longish post. To give some context my gf and I are both 21, and we lived together for 3 years during university. This is the 4th year and because of Covid and everything she’s had to move back with parents and I’m staying at my bros. We haven’t really seen each other since September. Fast forward to yesterday night, we were having a conversation about our relationship when I asked if she’s texted anyone during this time. To keep it short, some guy she used to know and liked her popped up in her snap messages 2 weeks before Christmas. Apparently she told him she was in a relationship straight away and the guy seemed cool with it so she thought they could be friends as she doesn’t really have any. Long story short, she got drunk at Christmas, and apparently sent him nudes with fully naked pictures of her and some with toys. All were pictures she had taken and sent to me in the past. Apparently she felt disgusted etc and they didn’t talk again after that night. He texted her at New Years and she only wished back, before deleting him 3 weeks later as she had to process what she did. Supposedly at least. The saddest and most hurtful thing is during that night she was sending me drunkish dancing snaps and telling me how much she misses me. She told me he texted her after she started sending me snaps and she sent him the already taken nudes at 4-5. She claimed that it had nothing to do with him as she doesnt like him but she was frustrated she couldn’t see me and I guess needed to get some sort of male attention since mine wasn’t enough.Now my gf had caught me having an interest for a girl 2 years ago, but there was no texting involved with her. I had simply talked about her with a friend of mine on fb and she forgave me. I understand that what she did is worse but she came out and was honest with me when I asked her if she had texted anyone so knowing her I don’t think she lied about anything. At the same time, before I learned about that night, her and I had realised that our relationship lacks the mental connection and excitement it once had. She wants to work through the issues, I’ve asked for some space but I genuinely don’t see myself going back. How do I proceed from here?