Kinda relationship talk?

Okay so I have this best guy friend that I have been friends with for 3 years now and I started to grow feelings for him but I didn’t want to tell him. I felt like he knew I liked him but he would bring girls he was talking to at the time around me or he would tell me about them like friends would do and it would break my heart... I tried to distance myself from him but when he asked why I was avoiding him I couldn’t tell him I liked him and I needed to get over him because I didn’t want to humiliate myself... well about a week ago he told me that he is starting to grow feelings for me but he’s “not ready for a relationship” but since then we act like bf and gf in a way. Well he gets upset if guys are flirting with me and he usually tells me he was upset but he says he knows he can’t tell me to wait for him to be ready so he tries not to say anything.. well I usually don’t get upset if he talks to girls but he told me he doesn’t have his Instagram anymore like a few days ago and tonight while we were hanging out his phone went off and it was right next to me so I looked at it and it was a message from a girl on Instagram... I know I shouldn’t be upset because we aren’t together but I’m kinda upset that he lied about not having his Instagram anymore... idk what to do...