Is it normal to be in love with an online taken guy?

okay so about 4 years ago i met him online. We used to talk everyday and we dated online once or twice but it didn't work out cause of the distance. I was the one to break up both times. We stopped talking and after like a year we started again and this time not only texting but also calling a lot. I fell for him again. He has a girl but in one of our calls he told me that he doesn't really feel right with her. One night, a few days ago i was drunk and i texted him that I like him and i confessed my feelings. Since then he has been much colder and not as sweet as he used to be but he is still polite often calls me adorable and says he loves me. He just stopped replying so fast and so good but thats just natural i think. Anyways what I'm trying to ask is what should i do?