Is it possible? Sure. Is it likely? I don’t know. I think the fact that you feel its a chore and have little interest is your answer.

When I was first starting to go through my separation and divorce, I had an old girlfriend contact me and I was tempted to try and get back with her because I was feeling so alone. But a friend said something that really struck me- she was an EX girlfriend for a reason. Someone popping into your life after a year with no explanation and wanting to immediately get into a relationship again sounds… convenient. My best guess would be the girl he was cheating on you with (and yes- reading what happened, I do think thats the case) left him and now he’s thinking of you as his fallback option. You deserve far better than that.