Is this narcissistic behavior?

Im gunna make this to the point. I moved my child and I out of Texas to Cali to live with my baby daddy . It seemed like a good idea since we both matured and fell in love again after having broke up before I got pregnant. Things have been going well, and we are going to counseling before deciding on getting married to hash out old issues. Before moving out here, I know he had his group of friends which included girls, I was okay with that because so did I. After moving out here, one of his girl friends (who’s boyfriend was also my boyfriends friend as they’re in the military together) tried pursuing a freindship with me. I asked my boyfriend and this girl separately how they all met as she’s a civilian. They both answered awkwardly but didn’t say anything straightforward I figured from their answers that they had something before I moved out here and before she got into another relationship. My boyfriend would answer oh I don’t remember. Well today after asking again because we brought up his friends, he said “I don’t know”. And I gave him the look and he finally said he met her through tinder and was hooking up with her before me. Which is fine. That’s not what bothered me. The fact that this chick was trying to pursue a friendship with me and he knew that, and after multiple times of asking him he LIED to me each time. THATS what Im mad about. This chick has been in our home, around our child, and around me. And yet he lied. He turned the whole argument around saying I told him I never wanted to know who he fucked. Which is true but if the bitch is in our house hanging around us I THINK I HAVE A RIGHT TO KNOW?? No wonder they were always awkward around eachother. Her boyfriend knew they were fuck buddies so idk why no one clued me in. But now he’s over here playing victim making me feel like I did something wrong? We worked so hard on our relationship and for this to happen… I don’t know how we can move forward if he doesn’t see his actions were wrong. Advice I guess? And I’ve tried to talk calmly to him but he still said “I don’t see what I’ve done is wrong” is this not narcissistic