Im falling for him.....he is hard to figure out....HELP?

We have known eachother for 4 months. We chill all the times and are really cool. we have made out a couple of times and I just love the way I feel when Im with him. We text a lot to eachother about freaky things...We work in the same place and we dont want anyone to know we got a friendship of that kind. We have gotten into a few fights and we end up not talking to eachother for a few days. But we always end up talking about it a few days later. Well atleast he is the one that always comes to talk about the issue.Now, I have another problem.... He gots a son and sttill lives with the baby mamma. He dont talk about her at all and one time I said something like"I cant be messing with you because of your situation". He got so pissed and said"Yo' dont mention that again, you dont even know how it is". I never again mentioned her again. Then a month later he started making me jealous with some girls at work as if trying to figure something out and for the first time ever I felt jealous....