If a girl calls a guy 'baby' or 'babe' does that necessarily mean they go out?

[Summer77]

So theres a guy I've liked for a very long time. He seems to like me, because he has called me pretty when we went to the movies, and flirts with me a lot. All of my friends think he likes me too.

He also has a Twitter, and he just tweets about his favorite singer. He only has a couple friends from real life on there. But, there is this one girl who he talks to sometimes on there. She does piano covers and lives on the other side of the US. She has called him 'babe' and 'baby' with a heart. They have also said "I love you," or "I love you too." They don't even know each other in person.

On his facebook it says he is single...and he still flirts with me. A lot. I don't understand! If they are saying these things to each other, do they go out? What should I do? Thanks.