1st Love

I can't forget my 1st love . At first i thought leaving him will set me free but everyday seem so hard. Everyday I can't help thinking about him. We both have our own lives and relationships now. But, I don't know why I'm still like this. I don't know what am I suppose to do. I don't know if I still love him. I want to forget him but there's someone around me that looks like him w/c reminds me more and it's killing me. help me please.