What's the deal with my friend?

So to start things up I love my best friend but not going to talk much about that on here since I talk that about her on my introduction and in another topics here.
She has a boyfriend and then there are other 3 guys she chats with as I mention in the other posts I spend about almost all day everyday with her, her dad doesn't let her go out if it isn't with me, I go pick her up at 9 am from Monday to Friday and drop her of at her house at 8 or 9 pm those days the only days she sees her boyfriend are Tuesday and Thursday that are the only days I drop her of and pick her up from her boyfriend's house so she sees him about 3 hours each day, he doesn't go to her house because her dad doesn't know she has a boyfriend and he lives in other city, I live near her in the same city and on weekends we have class early morning on Saturday so I pick her up at 5:40am and after class I spend the rest of the day at her house, same on Sunday I go to her house at 10am and spend the rest of the day there so she doesn't go out much. Lately I seen her chat and talk romantically on Whatsapp, at first I didn't pay much attention to it since I thought she was talking to her boyfriend but then I notice her phone and saw she was chatting with 4 different people one of those chats was her boyfriend and the other were other guys, one guy in particular that we met 3 weeks ago, now I see her talking a lot with him almost a big part of the day she talks with him, Yesterdays she told me to go out and eat so I agree since we do sometimes but as we were going she told me that this guys is going didn't like it but I said ok, when we arrive she kinda was walking close to him but I was on the ways and didn't like it, and she was all friendly with him almost as friendly with him as she is with me, but what got me was that she was calling him darling and sweetheart, and like she try to give him a hug or lie in his shoulder, one thing I don't get is that she greets him with a cheek kiss same when we part ways but she doesn't greet me that way. So that's the thing I'm curious about is she into him or something since she is so close to him really fast, while it took me about 8 months to get really close to her.
All the guys she talks to with the exception of this guy I talked about have told her they like her and she has reply back at them and talks flirty with them.

Dude.......the only reason she has you around is NOT because she likes you, but it's because without you she can't meet up with these guys. You are a damn fool if you can't see that she is just using you, and is taking advantage of the fact you are crushin on her.....she has you wrapped around her little finger.