Falling in love...maybe?

How did you know you were falling in love? I’ll be honest ladies although I have 3 beautiful children I have never been in love. Yes I’ve liked people, had crushes, ect.. but honestly I’ve never cared for anyone , until now...the craziest thing is we are only seeing one another, not officially dating. I have these crazy thoughts and feelings for him. My emotions are so all over the place and I literally feel addicted to him. I want to be with him 24/7 because I feel so beyond ecstatic with him it’s unbelievable...so my question is, ladies when or how did you realize you were falling in love..honestly I’m so scared/nervous I’m falling for a man I’m not even dating...