I feel like we're falling apart....😢

Lately I feel like my boyfriend and I are falling apart. I feel like he isn't happy with me anymore. I try everything to make him happy, he always says he's happy and that he loves me but I don't see it in him the way I use to. I want to talk to him and ask him if he truly is happy and if he wants this relationship as bad as I do but I don't know how to bring it up... I'm not one to talk about my feelings but we need to talk about this stuff like adults before we lose each other for good. What do I say? How do I go about bringing it up, and how do I talk about it without breaking down and crying or causing a fight. I love him so much and I'm willing to work it out but I just need help and advice. I've never been this in love before. I truly can't lose him....