help!!!!!Please

so I'm 16 and I have told my mom that I have thought about having sex but she doesn't know that within the last month(30 days not January alone) I've had sex 3 times all with one guy at his house and his parents are cool with that stuff but he's 18 and a senior (we will call him dean) and my best friend (he's a guy) (we will call him Sam)knows about this and all the juicy details. I've known dean for about 4 months and I've known Sam since the start of freshman year we are both know sophomores. Sam is my bestest friend ever and I love him but what I need help with is I can't tell if I'm developing feelings for him and we have already discussed this it would either be a really long relationship or really short one (a month or less). I have been told by 3 people we would look cute together and asked by at least if I had feelings for him or if he had feelings for me. I just need help cause me and dean have talked and we like to have sex but us being a thing would never happen he still likes his ex and "could never see himself without her in his future" and me and Sam are bestest friends. and I just don't know ow what to do please help.