met someone new!! is he the one?

So I  broke up with my sons father and he's been the only guy I've slept with for the past 6 years.. We broke up for good and a little after I started talking to someone else he is super sweet and caring and he accepts all of me as well as he accepts the fact that I do have a child...lately I've been having the urge to want to have sex with him but at the same time I feel like I'm betraying my sons father because he's been my sex partner for the past 6 years.. What do I do? Help please I need advice