Bitten by the love bug

Hey ladies, I've been in a new relationship for about 4 months now. He's a sweet guy, smart, treats me well. When did you realize you had feelings for your SO? I started off liking him and now my feelings are getting more deep. It hit me the other day...has this happened to you? I haven't told him yet, think it is early still. He hasn't said it either but I like it because my ex in my last relationship said it too soon...only was doing so for money :(