One person is enough for me!

I'm so tired of hearing from my boyfriend that he wants a threesome. He says for his birthday this month on the 30th that he wants another girl involved. He claims he doesnt want to fuck her but just wants to watch me and her. Funny thing is...he told me he kind of just wants to be left alone on his birthday and he just wants to be relaxing at home. We live together. But now he says he wants a threesome for his bday. So wow OK.....you want to be left alone on your bday unless another girl is there basically? How fucked up is that? Did I forget to mention I'm about to be 6 months pregnant? You have no clue how that makes me feel. Yes I can get freaky and be spontaneous... But I'm freaking pregnant right now feeling gross and I'm definitely not into that at the moment! For me....one person is enough and that's the one person I'm dating. This isn't the first time he's asked either. He keeps making me feel so gross and like I'm not enough or something. I'll admit I haven't been as into sex lately or into different things & its not even because of pregnancy. Its because he makes me feel so insecure and disgusting. I feel like Im never enough for him.