is he in the wrong?

💎 • 11/12/14 • CA
My boyfriend was looking through my phone, which is okay, since I made some really bad choices in the past and now he needs to build up his trust for me, so once in a while he'll grab my phone and look through it. Perfectly fine. I think it's a great way for him to see that I'm not as immature as I was in the past. 
Right now he was looking at my messages, a group chat with my two gay best friends. 
All we talk about is typical things, school, people, music, celebrities, etc. typical teen stuff. What else can I talk about with two gay guys, what can I hide? 
I bought my boyfriend's anniversary gift last night, two little star wars figures, and I sent it to the group chat, and told my besties about them. 
My boyfriend was scrolling up through the convo and I said "Wait, stop." And I told him not to go up, that I had sent them a picture of his anniversary gift and I didn't want him to see. 
I grabbed my phone and deleted the convo. 
He got mad and said that I'm probably trying to hide something. If I wasn't hiding anything that I wouldn't have done that and I would've found a way to let him see without spoiling the present. 
His dad came to pick him up and he didn't even hug me or anything he just left. 
I explained it to him and he won't listen. 
Am I in the wrong? I know he hasn't gained back all his trust in me and I should be respectful of that but how am I supposed to  just let him see his anniversary gift?