husband and friend

I think my husband has a thing for my friend. He always makes jokes about how if she needs sex hell give it to her because I never have sex with him and she's super single and can never find someone serious or a good fb that she trusts. And they always see each other around school pick up which is no big toot but the other day I said something about what she did and how I would do it differently and he was defending her and yelling at me. And he's been doing that a lot lately... and I'm currently pregnant, we don't have sex because while I'm pregnant I hate sex, and I'm huge now due to extra large baby. So I'm sure he's no longer attracted to me. And she's pretty and in good shape. Oh and he's said before he has wondered what her tits look like and what she'd be like in bed idk I'm having a hard time with this... am I crazy, should I worry? I don't think she'd do anything like that but whos to say right?