ok..what's up with this?

My ex husband and I were living together but separate rooms then I moved out to think about things and decide if I wanted to try to rebuild things and less than a month later after begging me not to he sent divorce papers and started a fight dirty custody battle. Now we have been divorced over a year and he kept saying you should find a boyfriend even though he does not have a girlfriend. I began dating this guy a few months ago and when he found out all he does is ask personal noyb questions..."Are you going to move in with him and give me the kids?"..hell no!! and "when/if I had sex?". I didn't answer so he just assumed I did and lectures me like a dad would lecture a teenager...I am 37 and he's my ex so huh??? today he asked if the guy called me because he has backed off afraid of commitment and if he broke my heart and I cried. Also said "a mutual friend just stood there and let him do this?" How does a guy have that kind of control over a not that close of friend??? Everyone says it is jealousy because he wants me back but he says he wouldn't take me back and I certainly wouldn't go back but that is not part of this question.....strange isn't it?????