My boyfriend cries in his sleep?

He's done it twice now.

i was asleep and I kept hearing him breathe in and it sounded uncontrollable and he would make little whimpering sounds and when I turned to see his faced he looked really upset and sad although he was still mostly asleep.. I put my hand on his face and he stopped immediately and I pulled him close and then I fell asleep like that. the next morning he didn't say anything or act any different so I went along with it. then a couple nights later he did it again. I started to kiss him and hug him and stuff and he stopped immediately again..

we haven't been fighting and there's no huge problems going on in our life. we aren't perfect though. I don't know how to bring it up or what to say to him.

I'm almost sure if I do he'll get really embarrassed or deny it. I'm a little sad that he doesn't feel like he can come to me if something is wrong with him. my friend says I should let him get past it himself because no man wants to cry to his girlfriend. is this right? should I let hm deal with it himself or bring it up to him. I feel a little helpless, I love him more than anything. I just don't know what I should do to make him feel better. or what's even wrong.
My boyfriend cries in his sleep?
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