Advice needed. ...

Elizabeth
So I need advice ladies. I have been sleeping with this guy for a month now. When we first started talking he told me he wasn't looking for a relationship and that he is still in love with his ex. I made the conscious decision to sleep with him mainly because I am seperated from my husband, we haven't even started the divorce process yet, so I figured that I shouldn't be in a relationship anyway so just have fun with him. However he turns out to be the best sex I have ever had...We doing all the couple shit, like going out to lunch, dinner, he has been attending all of my family's gatherings and now my family likes him and worst I am catching feelings. I think I should just run now....What do you guys think, should I tell him that I am catching feelings or run...