I feel like my relationship is failing

I have been with my boyfriend for about 9 months now and lately I have just felt like there’s no love any more. I know I love him, but some moments I feel like we are at our best. We will be kissing each other goodnight or just cuddling and I will love every second. I wouldn’t wish for anything else in the world. But then when we argue and he gets angry and says things he may or may not mean, I feel like he doesn’t love me at all and I lose the love too. When we have sex I feel like there’s nothing there. Does anyone else do this or is it just me? I struggle with depression sometimes. Does this happen to other people like they are going through a phase? I don’t know if it should feel normal.