9 years old

i’ve known this guy (t) since we were 9 years old but we lost touch. now we’re 21 and we met back up again. he always liked me and claims he still does. problem is he has a girlfriend who he’s been with for 2 months. yes months not years. but he comes to my house all the time and even performed oral sex on me (which i didnt have to do anything back and he’s tried to have sexual intercourse with me numerous times but i always reject him) and claims he really likes me but its too late to get together right now because he has a girlfriend. i respect that but every time my phone rings he quickly says “who is that calling you?” also he asks me “who is that texting you?” and very recently he went through my cell phone when i wasnt looking and started reading my text messages out loud. also, when i was talking to another guy on the computer he (t) loudly said “bae wat you doing?”. also, when my step brother was at my house t asked me “who is that at your house? another guy you invited over?” also, once he said “im not gonna lie. i get mad and jealous when you talk to other guys. i dont want any guys talking to you.” he also asks me where am i at a lot and calls me but only at night.

im confused. why does he act like he cares who i talk to when he has a girlfriend that he is clearly not trying to break up with? is this just him pretending he cares so he can have sex with me or does he actually care about me?