[King]

If there's more problems than ways to fix the problems in your current relationship, I'd call it quits. It's been a good 6 months and at the end of the day you're only 16 - you've got plenty of time to explore your choices, go into relationships and come out of them.

If the college guy is your age, it's more appropriate as they're likely to share your interests and your sense of humour, you've already expressed how much you like being him, missing him etcetera. You don't have to cheat on him, you can end your current relationship (it'd be easier if he was drunk) and try things with the new one.