How do you know when your in love?

Hey ladies,

I love the GLOW community! You guys are so awesome. That’s why I decided to ask this one simple question. I’m hoping I can get some reasonable answers lol here’s a little back ground information about my relationship:

I met my now boyfriend from a mutual friend in 2016. We are 15 years apart. He’s 41 and I’m 27. We have many things in common… And every day I’m with him I feel like I’m falling in love with him deeper and deeper. My question is how do you guys usually know when you’re in love? And if I’m in love… Do you think I should tell him? Thanks in advance 😀