Wtf?! Sorry that it's long

So my bf & I have been together for 3 months. He treats me well for the most part & it does to a certain degree make me happy. Well I called him yesterday to see how he was & he said he went to the store that I work at & saw this new girl so he went to her register & had a small conversation with her. I was like cool with it like I trust him & I don't care if he talks to girls as long as he stays loyal to me. Well I ask him about some sex because I was kinda in the mood & he says no which is fine but then go, "but you know who could get piped down, that new girl over at your job." I'm kinda upset that he even considered it & we end the phone call because he started acting weird after that. Well he came over yesterday to see me & he had dinner with my family & I. Well we were watching TV in my room & I'm cuddling with him & just playing with him. Well my hand went into his pocket for some reason & he jumps as if I took something important to him & he moves my hand away & says no. I'm not even trying to do anything & I'm like wtf you good? He's like yeah. Something seemed off so I did that again & he moves my hand away as if he's trying to hide something. He does the same thing with his phone. I'm just like what's in the pocket that you jumped so quickly at & you dont want me to see. He's like nothing, dont worry about it. Well I'm getting upset because he won't tell me & we're supposed to be honest with each other & he's being weird. I get irritated & he's about to walk out the house like he doesn't care & I'm just like you could just tell me what's in the pocket. He's acting as if he didn't want me to find out anything which is odd. Well he gives me what's in his pocket & it's a receipt to my job with no number or anything on it & he starts going back in my room to chill. I'm just like you could've at least told me but you were acting so weird & he goes well you're the one assuming things & I'm just like whatever. He does shit like that then either says that he's only messing around or he says that I'm assuming things. It just irritates me & he knows it too. Did I do something wrong or no?