Trip with someone else's boyfriend??

Hey guys, so basically like a couple months ago I met this guy on instagram and then we started talking on Snapchat a lot and really just became like legit best friends. We talk on the phone slot and we're always laughing, we both had the same sense of humor andIdk we just click. And we say stuff like "goodnight love you!" And just friendly stuff like that. Thing is, He has a girlfriend tho, he broke up with her but then go back together but it definitely doesn't seem like they collide together, we tell each other everything and she just doesn't seem like what he wants and doesnt seem to make him happy. But yeah I'm just thinking is is okay for us to say love you? We're just friends! We do compliment each other tho too, but it's always friendly. Whenever I talk to him I can't help but smile, we talked to our parents and we're ganna meet in person at the end of he summer at the state fair! I'm just wondering what is to far? Like am I being to much since he has a girlfriend? Is this whole trip wrong?? Anyway please lemme know what you think. We're both 17 so it's not like we're just a couple of dumb kids btw, feel like that's important to add. Oh and sometimes I feel like im starting to like him but he has a gf so I'm trying not to, but I definitely feel the chemistry and don't know what to do about it! He lives so far away so it wouldn't work out, but I mean the heart wants what the heart wants ya know, so I don't really know what to do.

Update: You're all saying its wrong to say ily to a friend? If I had a boyfriend who had a FRIEND say "love ya homie" I wouldn't have a problem, we aren't doing anything wrong so she should have no reason not to trust him on the trip. (And yeah there will be others with us) and all I said was I'm feeling it which is wayyyy different from it actually happening