How to tell he just being friendly or likes me more than just a friend?

There is a guy I just recently met he is outgoing and the flirty type. So he is not shy around women. I am the opposite I am shy and not the flirty type. We talked when we first met never really thought nothing more than just talked like friends do. Then his behavior changed around me he no longer would talk to me especially around his friends he would only talk to me when were alone. I have tried to get him to open up with his friends around to approach me and talk like I do but this guy will not. He acts shy towards me when there is a lot of people around but if we are alone he can flirt with me. Which I do not understand because I see him talking with girls for some reason he seems to be intimidated by me or just too scared to approach me in front of his friends. He acts and treats me different than he does with the other girls. I catch him looking at me sometimes he is really nervous if I look directly into his eyes. This guy has also on a number of times look deep into my eyes and hold his gaze longer. He has given me winks and smile with his face lit up number times. Sometimes he will smile and give me a nod and not say a word to me. He likes being close to me by being into my personal space. He really likes brushing up against me done this a lot. If he sees me talking to other guys he seems to be jealous acts nervous and stares at me. I tested him to see what his reaction would be if I wear a low cut top not too revealing and he stares more when I wear something low cut. I have seen the other girls he is friends with wear low cut shirts sometimes but he does stare at them. I just do not get it why would a outgoing guy who is the flirty type be afraid of me who is shy not the flirty type? Since I know he can talk to girls not afraid of them but his behavior around the other girls is more jokily. Is he just being friendly and wants to be my friend like he is with the other girls or does he want to be more than just friends?How to tell he just being friendly or likes me more than just a friend?
heyy:) i'm sensing that this guy is confused about you...i'm pretty sure that he's liked you once upon a time..although it's hard to tell...if you really like this guy, then go after him if he pays no attention after a while, get over him, and find someone else

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