First, I think it's unreasonable to tell anyone to just "snap out of" feelings, especially feeling horny... we're humans! We have sexual drives and have always had them since the beginning of time. You can't just turn them off which is something he has to understand, first and foremost.

Second, it sounds like you really need to communicate how you're feeling. Someone who is worth continuing to pursue will understand how you feel or at least make an effort to. If that's not something that you can work through, then it may be a good idea to see other people. Communication is key and sex is a big issue that adults have to deal with. If you two aren't on the same page there, then you have a right to yourselves to pursue fulfilling your needs in other ways.