So me and my ex were together for 1.5 years and long distance for 1 year. During this time he cheated on me with another girl all the while saying he will come back here.

3 months before I was supposed to see him again I found out about the affair.

Now I have moved on (or I thought I have) and got into a relationship with a wonderful man. I've only been with this new guy for 2 months now. Then suddenly I saw from my ex's sister's instagram that he's back here.

I felt all sorts of feelings I can't quite tell what. A few days passed and I caught myself stalking his sister because I want to know what he is up to.

Today out of curiosity I checked the instagram account of the girl he cheated on me with. They're still together and doing long distance. His sister even follows her instagram. Makes me really sad and hurt seeing this. Does that mean I'm still not over him? What do I do?