Am i doing the right thing?

If I were you, I'd probably be a little suspicious too. (esp if he was like that during your first year of dating) People rarely change, but who knows? Maybe he did. You can either trust him or leave him. You have to think about everything else if you decide breaking up is the right choice, though. Like your kid and how it will effect their life. If he really loves you and respects you he would listen to you and understand your insecurity and try to make you feel better. Good luck.