34 weeks pregnant and depressed

Hello! I’m currently 34 weeks pregnant with my first and I couldn’t be more excited! But unfortunately I’ve been feeling very down and alone lately. My boyfriend has been super excited about the pregnancy since it will be his first child as well. We have been together since we were 18 and we are both turning 25 this year. He has been working very hard to support our little growing family and I know he’s been stressed. But over the past couple of days he’s just been very reserved and very irritable. He doesn’t really talk to me or engage with me in conversation. The smallest things have been making him angry. I tried talking to him about it, but he doesn’t really like to open up. He says that talking about his stress won’t make it go away so he doesn’t wanna talk about it. I just don’t know what to do because I try to be there for him but I feel like he is closing me out and isolating himself not only for me, but from everybody. I want to bring our baby into a house full of love and happiness, and I’m just scared that she won’t be. Has anybody gone through something similar with their partners? I could really use some advice on how to push through this with him.