Uggghh help with my lame situation PLEASE!!!!!?

[Nobody]

Ok I will try to explain this as quick as possible.

I have know lets say his name is Tim for nearly 5 years.

We call eachother besties. We flirt alot on phone cos hes currently working overseas.

I want to take things more serious and he knows it to.

Long story short. He now has a girlfriend. Funny thing is he hasnt even mentioned anything about her to me. (No, I was not stalking him...lets just say its amazing what you can find on instagram/twitter)

The flirting is still going on though? I mean I asked him the other night "So, are you seeing someone there" to which he replied "No". I JUST DONT GET IT???

Why isn't he being honest with me? I just want to know where I stand. They say the people you love can be the ones that hurt you the most. UGGGH I feel like a loser. IDK how to overcome this lame situation. I mean its stupid to feel depressed over a person..but right now I cant help it. I hardly eat, I cant sleep properly, he is always on my mind, I feel stupid looking up her twitter/instagram just to see what shes up to. It KILLS me when she mentions stuff about him. I cant take it anymore. PLEASE HELP. I NEED TO GET RID OF THIS EMPTINESS FEELING I HAVE. I HATE IT WITH A PASSION. x