boyfriend only wants to receive oral sex.

Dakota • 22 • Pregnant with 🌈👶🏼 #1 due september ‘18 • mommy to 4 angels 👼🏼
So i'm a young, healthy 22 year old girl. With what i consider a normal sexdrive. 
But here it comes, me boyfriend wants me to give him head everyday, sometimes multiple times a day, without giving anything in return. No penetration, no going down on me. When I do not give him head when he wants to, we get into a huge fight. 
It's been like this for the last couple of months, like 4 months or so. Before he wasn't like that, he enjoyed going down on me & actually have sex with me. 
Now we have sex once every two weeks, i get frustrated about it. I have my needs. We talked about this for hours, but he doesn't change. I even asked him upfront: IS THERE SOMETHING WRONG DOWN THERE?! Smell or taste anything that bothers you? He said no not at all. But I'm still here, waiting dor him to FINALLY go down on me again, or give me some bomb ass sex! 
Okay, had to get that out 😅