Should i date this guy after all thats happened?

ok. so. a while ago, probly like a month and a half, me and my friends shelby and alexis went to our friend tiffanys house. tiffany is in 6th grade and were in 8th and tiff has a bro named john whos in the 8th with us. and when we went to tiffs house john invited over robbie taylon and cory from the 8th grade and things went kinda wierd and we played truth or dare and spin the bottle and all the girls ended up kissing all the guys at least once if not more. me and robbie kissed 4 times and we started liking eachother and he gave me a goodnite kiss that wasnt a dare (: not so bad, cept for i had a bf(tim) and robbie had a gf(morgan). and the even worse part is that morgan was like one of my best friends. so the secret got out and robbies gf dumped him and my bf dumped me. morgan was extremely mad at me. well me and robbie kept talking and i thought he was gonna ask me out but him and morgan got back together. that made me mad but me and tim got back together but i still liked robbie. i likked robbie more than tim. well robbie still liked me too and we were talking on the internet a bunch and he told me he liked me alot and he wished me and him wouldve gone out instead of him and morgan. but i got sick of him telling me this stuff and not dating me so i told him he had to choose between me and morgan and he chose morgan. well morgan found out about me nad him tlaking and she dumped him. and i broke up with tim recently. so do u think i should date robbie if he asks me out? or should i tel him no because of everything hes done to me??(got back together with morgan when he couldve had me and then chose morgan over me after everything etc..)?? and btw i dont think morgan is going to ever forgive me even if i dont date him so i do realize it would make her mad if i did but i dont think it matters cuz she probly wont ever b my frined again anyways.