boy trubbles

I had this thing with this guy and it led on to a weekend together and stuff happend and we'll I caught feelings for him and I believe he caught feelings for me too but when I was ready to do something about it and speak up he got back with his ex girlfriend and I got back with my ex boyfriend but now him and my boyfriend are best friends and I really don't know what to do I see him everyday and he keeps kinda leading me on slowly...I really don't know what to do...