Dealing with Betrayal and Mental Illness

not this last Monday, but the Monday prior I was checked in to a crisis center. I had been here previously about a month and a half ago because my, then fiancee broke things off as we were getting ready to fill out our marriage paperwork. we had just gotten out of a tough bout of homelessness that lasted for about 2 months and we were finally settling into a place. or so I thought. she broke things off and I came here. I got out in the middle of the night. just up and left because she was going through stuff herself and it was either I leave to help her or I hear she did something stupid on the news the next day. well fast forwards to Sept. 24th. she again broke things off with me, and I didn't take it well this time. the next night she called out to me in her sleep by another man's name. I confronted her about it and she swore up and down that she just started talking with him. but I found out rather quickly that she had been sleeping with this man, in our bed, since I was in the crisis center the first time. since then I have been diagnosed with PTSD and DID to go along with my bipolar 2, anxiety, social anxiety and ADHD. but now I'm getting help, and Im still having issues every once in a while.