Stuck in between my first love, and my boyfriend..?

Alright, here is the story. I dated this guy Kyle for 20 months. When we broke up, it was the hardest thing I had ever imagined going through. About 3 in a half months ago I started to date my best guy friend Connor, weird right? Well, about two weeks ago I was at target with my 2 best friends and ran into Kyle, ( were still really good friends ) and he told me he was bored and going to his friends later and we had nothing to do so we went out there with him, and we all played twister for a hour and left but when we hugged goodbye it felt like we were still together and we both just didn't want to let go. My boyfriend was out getting high, a normal thing for him. Well the past two weeks Kyle has been trying to prove to me that he still loves me and cares for me and wants me back and of course I still feel strong for him but I care a lot about my boyfriend and don't want to lose it all with him. Kyle knew my favorite song was "the other side of the door" so about a week ago he threw pebbles at my window and yelled he was in love with me which is quotes in the song which I thought was cute. But Connor and I started arguing because things seemed to be changing, which I think involved Kyle a lot and my feelings but we got in a small argument and he broke up with me shut his phone off and just pretty much left me there to cry and not talk about it, the next day at school he acted like nothing happened and talked to me and we got back together but Kyle is still insisting of being with me he said he'll do anything to prove to me that he wants me.. Connor is a good boyfriend most days, I mean he smokes a lot of weed which doesn't bother me.. to much. I don't smoke but to each his own. He mentions a lot, which I'm a virgin and he isn't.. it tends to bother me but I figure its just a guy being a guy, right? Well, we are going to his friend's valentines party after I get off work at 9, and he said "you realize I will be really really high so if I ignore you don't take it to heart" then later said "you better dance with me, I don't wanna end up dancing on another girl and you get pissy" ... it kind of sounded bogus to me.. Kyle broke my heart before, I'm scared he'd do it, but then I think, what if we could work out and I never find out cause I'm to scared to take a risk. But what if I risk it all and lose Connor.. I don't know what to do, so can anyone please just help me a bit, or give me advice :(