How did you know you loved you SO?

I think I’m slowly falling in love with my current bf but I don’t know if I actually love him yet. We’ve known each other 3 months. Been official for just a month. This sounds quick I know. But we’ve gotten so close and have such a healthy dynamic. I haven’t felt like this in a long time, if ever. I can’t remember when I fell in love with my ex, bc when I told him I loved him was probably 6 years ago… we were together 4 years, I think I stopped loving him by the end of the third year.. broke up 2 years ago.

My new bf is so nice and patient with me. He communicates so well. We talk about everything, see each other lots but not too much, we got our own rhythms with work/other responsibilities but fit each other into our lives so well. We haven’t introduced each other to our friends and family yet, which I’m content with for now.