I don't know what to dooo😩

So I'm single I'm not in a relationship but I do talk to someone and we've had sex but I feel like it may not be going anywhere but at the same time it might I tend to overthink things and I really have feelings for him but my first love... he keeps popping up he had a gf but now his single I would never be in a relationship with him again but would I be wrong to sleep with him?