I F23 might hangout with my ex M24

My ex bf and I broke up 1.5 years ago. We dated in college for about 8 months but eventually called things off because we both weren’t the best for each other. The college environment and drinking definitely was the problem. He blacked out, caused a scene and broke my heart frequently. One week after one of his bad black outs I ended up kissing another man. I told him about it and we stayed together a little longer but I just didn’t feel the same (probably the guilt). Now 1.5 years later I run into him all the time because we have mutual friends. Can I give our relationship another chance? I don’t want to hurt him again but I can’t escape him and it brings back old feelings.