So there's this guy......

There's this boy that I'm dating and I like him very much & he likes me too (unless I'm being lied to? Lol) well yeah he's nice sweet and caring and all that and faithful and blah blah. Sometimes he jokes around about us having sex and all that (we're both virgins me 18, him 19) he's going away to college in another state while I'm staying in my home state in June. Sometimes I actually do think I want to have sex with him but sometimes I think I'm not mentally or emotionally ready. Especially since he is about to leave and I'm scared of a heart break or something going bad. But then again I want to do it. Please give me some advice or share some stories about similar situations. Something that'll comfort me