Ex Boyfriend Problems, Help!

Ok hey guys I'm kind of new to the community, but I wanted y'all opinions on a situation I'm facing as I'm typing this. So I have a ex who cheated on me and lied to me for years now but I always seem to let him back in cause it's always something inside of me saying take him back, so tonight he wants to come see me and I want to see him to because he gives the best sexual intercoese but we've never had sex but I don't know if I should do it . Somebody help me