Relationships ... or a lack there of

So I had a guy and I really liked him but whenever we would get to close I would freak out a little bit. I have a list and he doesn't meet the qualities on this list. Well i finally told him last week that I had strong feelings for him and he never responded. I decided to text him today and see if he wanted to get coffee. Well, he is already dating someone (I already knew this) and he says he likes both of us a lot. Now mincd you he has only been dating this person for like 3 weeks, so if he likes her as much as he likes me then he can't like me as much as I like him. I messaged him back and forth for a while over text (never can be a convo on the phone or in person) and I think now I just need to let him go.