What should a cancer girl do with a taurus boy?

by Miss Me
(Pennslyvania)

Ok I am a Cancer woman and I met a Taurus guy while out in my town. We talked forever and then I looked him up online and we talked even more. He asked me out But I really was unsure because he told me that he is trying to make things work with his childrens mother so I wasn't really interested in being the other woman so I blew him off a cpl times, then finally we hooked up and went out.
It was so nice we had fun I was shy he was talkative and at the end of the night he gave me a kiss. I was shocked because he has a girlfriend but ever since that day we went out we have been communicating everyday and I really have grown to like him. He says that he likes me too and there is not a day that goes by that we dont chat, But he still has his girlfriend and his family so I dont want to fall head over hills though thats what it really feels like and it seems like he really likes me too. But I don't know what to do.
At times I want to tell him I love him because everything seems so right between us like we were meant to be but I know that some things can just be too good to be true and so I try not to be so attached but I cant help myself!!! What should I do? We have only been talking for a cpl of months now we just started making out which feels so good but we never had sex which is fine with me. I just want to know if there is a chance he will leave her and just be there for his kids or he will just string me along and stay with her? I don't want to break up a home and I don't really like being the other woman but now my emotions and feelings are all caught up in this guy and I just cant shake it. If we could talk all day everyday I would and I think he wouldnt mind either. We really enjoy each others company but is this just a Fantasy? Please Help Me!!!!