How do you know you are in love?

I’ve been with my guy for 6.5 months but everything about him is perfect and suits my personality amazingly. We have a connection on so many levels and have sex multiple times when we see each other which is about 3 times a week. We don’t fight at all and I’m very attracted to him. How do you know when you are in love and whether he is the one? How would I know if he loves me?