Break ups/GAD

Does anyone here with GAD (general anxiety disorder) feel like going through a break up is the end of the world?? Last December (I know) I broke up with my ex, it was clear we weren't good for each other but since we were in the same friend group I would still see him around and we were still hanging out one on one and hooking up until February, until like a month ago when he started seeing someone new and bringing her around our friend group. I have a therapist and Im trying to not do anything that triggers me to feel anxious (look at his social media, etc) but some days feel I have legitimately no energy and don't want to get out of bed. I have thoughts that I regret breaking up but I know ultimately it was the best so Im just wondering how people deal with rumination and moving on— especially if you have GAD