confused

so I’m currently in a somewhat middle school relationship meaning no hanging out just once, only texts, don’t hang out.. I’m in high school and so is he. well I met this guy who is super sweet and is slowly winning me over, I see him more and I guess that’s what is making me fall.. what do I do?? I tried breaking up w the other guy like 2 times but it just never works I feel like a terrible person but he just doesn’t make me as happy as he did before.. I don’t ever want to cheat but I would feel terrible leaving him..