Back to black

I've been off this site for ages cos I've been doing so well and thought I had moved on but the last week has made me feel like I haven't moved on at all. Can't stop thinking about this time last year my new partner was helping me get over my ex husband and I was feeling happy again. It wasn't ling till I found out he'd also been cheating the whole time and I can't stop thinking about it all. I keep wondering what he's doing and who he's seeing. I don't understand where it has all come from again.