It’s been 40 days since I haven’t talked to my ex fiancee and I saw her today

It’s been 40 days. I caught her woth another guy in bed. I dumped her and she cried to me a lot. Her friends tried to trap me with her. I bought a new house and sold the old one. I started getting back to a healthy weight and I stopped drinking and I am slowly letting go of the benzos. My 40 day streak is ruined. I saw her at the store, she greeted me and she followed me out to the parking lot and she started crying. She wants to come back but I can’t do that. She found better and should have stayed with him not move back and come with me