opinions!!

Okay so me and this guy had a thing for about a month but then we kinda fell off. We started talking again but he has a girlfriend now. We are really close and we both still have feelings and attraction toward each other. We've talked about have sex before and what would happen if we did. It would be very low key and we couldn't tell anyone for obvious reasons. My friends tell me I should and I want to, but I want to know what other people think about it!