My boyfriend always says to me, when hes mad or upset, and to his friends..?

So my boyfriend knocked me up, I decided to keep the baby, and he decided to stick around, some days he's cool with the thought, other days he's not, and some days he jst doesn't talk about it at all.. he already has a son, but his ex made him marry her, then left him and took all his ****, now he hardly gets to see his son because she has retarded excuses for him not too.. but anyways so when he's mad at me hell turn away and tell me he's cheating on me or there's another girl, or hell say that I caught him on a hook, but its ok because its easy to get out of hooks, like seriously why say these things to someone you suppoesedly love and you're about to have a kid with?? And sometimes, hell tell his friends, but I don't know if its serious or sarcastic, ugh!