What to do if someone is not communicating their needs well?

I struggle with the fact that my boyfriend (39) is very immature for his age. We can’t communicate well at all. When we argue, he immediately pulls back and pouts. He, however, says I keep moaning. I’ve already told him several times to tell me what was bothering him, but he doesn’t. We’re not getting anywhere this way and I’m so annoyed that I’m considering ending the relationship even though I love my boyfriend. L. (27, w)