my boyfriend won't have sex with me

Ever since I became pregnant I thought he would think I'm the most beautiful women ever . I mean he says I am every now and then but lately he hasn't been making me feel good about myself what so ever. I might sound dramatic but I'm seriously starting to get depressed. He hasn't touched me in a month ! We barely even kiss, I been wanting to have sex so bad but after 3rd time denying me because he was to "too tired" from work or any other dum excuse I feel pathetic to even ask. There's even days I'd get super pretty and he still won't touch me . How can we go from having sex almost everyday to not having sex for a month. I brought it up to him nicely before and he claimed I was being selfish bc he was tired. Am I being dramatic!? I know it's not because I'm getting bigger because I only weigh 120! And I'm 6 months.. Idk how to feel anymore , but I know I'm not a happy pregnant women anymore 😥