Fell out of love or...?

So my bf and I have been together about 3 years. We met through an app, so at first it was so thrilling and during that time in my life I really needed validation that I was lovable because I was struggling with depression. He’s always been so supportive and good to me. But lately I’ve been curious about other guys, and I’m jealous of my older sisters’ and friends relationships because they seem so happy. I don’t feel like my bf makes me laugh or that we have the same values at times. I also don’t like his family. But he is such a good guy, I wonder if I should just be grateful for him. I also think I may fall into depression again without his support.

What do I do? It’s driving me insane.