love?

Mattie
Alright, so I've been with my current boyfriend for 4 months so far. But the crazy thing is, we have been together literally every single day since we met. I messaged him on a dating app and we hung out THAT same exact day, and I've been around him ever since. I live with him now, and the only other person I've felt this way towards was the first guy I fell in love with. I know I love the current guy I'm with but I have no idea how to tell him or when I should.. or if I even should. He was in a relationship about 2 months before me with a girl for 4 years so it was really hard for him to open up to me at all. I'm so scared on what to do. Please help.