Search Results: check out other chicks

Me and my boyfriend have been together for 1 and a half years now
But 1 month ago we broke up because he got fed up with my trust issues and accusing him of cheating/flirting with other women
he's never cheated on me but my ex boyfriend did so i still have trust issues
But 2 weeks later, he called me and wanted to get back together again and I apologized to him
So we got back together

Anyway so I know his passwords to everything
His phone, tablet, laptop, email, etc
I went on his phone messages last night (I know its bad but I wanted to know if he was seeing other girls during breakup)
I didn't find anything (as in he didn't add any girls or went to see another girl)
But I did find something
- he messaged his best friend and he sent a photo of this girl and he said to him "im talking to this hot chick, gonna be my new girlfriend, easy bro😂"

I got pissed
And confronted my boyfriend
And he said "yeah I went on dating app to get my mind off you, was talking to girls on it, added them on instagram. I talked to her but she got weird and started asking me dumb questions so I blocked her. You can check my instagram block list. I dont care. And plus I saw you on it too so I got more pissed and talked to more girls. But i didn't go see them"
And he showed me his block list and he did block that girl
And i said "if u want her or other girls, why come back to me?"
Then he replied "isnt it obvious? I still have feelings for you and I felt weird talking to those other girls anyway"

I'll start with details. I've been with my boyfriend for almost 2 years now. We've gotten into arguments and even broke up once before because I was snooping on his snapchat. Before you paint me as an insecure stupid bitch, LISTEN TO MY REASONING.
We hung out and when he was showing me something on his phone, he got a message from someone. I only got a glance because he took it right away, but I for sure saw a girls name. M*****Marshall. (using fake names cus this is anonymous lol) I ask who it is and he says nobody. I start pouting and ask (and I guessed her name, wrong) "WHO IS MELISSA AND WHY ARE YOU BEING SO SHADY?" (He doesn't correct the name by the way). He says "okay, its just some girl from school asking about an assignment". When I got home you know DAMN WELL IM TRYNA FIND THIS GIRL. I type in "Me" in his friends list on facebook and find her. (remember, totally fake name) "Melissa Marshall". I check her page and find he's liking this chicks profile pics left and right. I check his followers and type "melissa" I FIND THE SAME GIRL AND HIM LIKING ALL HER SELFIES AND BIKINI PICTURES. I confront him asking why he lied, and he says because he thought i'd overreact. Over time I find out he plans to have classes with this girl every semester, they go out, and that she's apparently the only other female "close friend" he has besides me, BUT I'VE NEVER HEARD OF HER EVEN ONCE? I know if he has female friend he WANTS me to know about them and encourages me to hang with them. He keeps this one so secretive. I confronted him and he said that he'd stop taking classes with her and liking her pics so often if it made me uncomfortable. He promises.
I check his snap tonight and guess what the fuck I find? HE TALKS TO HER MORE THAN ME, REPLIES RIGHT AWAY, AND PLANS CLASSES WITH HER AGAIN.

I guess i'm asking, do I have a right to be angry? and should I confront him even though I went through his snapchat? SHOULD I CONFRONT HER?