Because he's a douchebag, and yes, you should tell your husband.
Honestly, this genuinely sounds like either he's jealous of the time you spend with him, or he's being cruel just to be cruel. Either way, he's a bully and he thinks he can get away with it. If he's treating you like this, he's not welcome in your home, period.
After you tell your husband, you and he should both confront this jerk. Be ready, he's going to deny it, say you're making stuff up, that you're overreacting because you're pregnant, and so on and so forth when a guy like this is finally faced with someone standing up to him. Be calm but firm: he leaves, and he's not coming back. And if he does come back, call the cops and report him for trespassing.
It may sound like I'm encouraging you to go a little overboard, but bullies don't stop until somebody smacks them down, hard.
Girlfriend, that guy is no FRIEND to your husband.
Imagine if one of your girlfriends did that to your husband when you were away?
You would not think she is a solid friend, and/or has some alterior motive. Hopefully, you also would question her loyalty to you.
This "friend" of his has issues. I'd put major distance between him and the pair of you.
Congrats on the new baby, and good luck!
Some kind of "friend" indeed! Like RP said!
And don't let this dbag get into you!
CONGRATULATIONS on the baby!!!
Wow, I'm so sorry you're even in this situation to begin with. Definitely tell your husband. And if he's not on your side, get a divorce
(not REALLY, but kind of...)
This individual is a sick f***. Neither you nor your husband need "friends" like this.
I've been in a similar situation. Back when still dating my husband, his nephew who is close in age was horrid to me when my husband wasn't around. He called me a bitch and other hurtful names.
They had always spent so much time together, usually doing what the nephew wanted. He seemed fine with me until I got engaged to his uncle and that is when he turned against me. He called me horrid names and was generally an asshole. I never mentioned it to my husband because I figured I could work it out with him. I made sure I was not alone with him and have always my encouraged by husband to spend family/friend time separate from me.
Eventually the nephew got a life and stopped the jealous behavior. He is married with kids now and he speaks to me and of me with respect.
I had to do this because it was family. I'm not sure I what I would have done if was a friend.