My partner thinks I’m just supposed to trust him again like that

 So my partner, we have four kids together and his grandma is 93 years old and he wants to go see her in Dominican Republic. I don’t mind at all, but he is close friends with a female friend. She is pregnant and he plans to hang out with her because apparently she knows his family and so on he didn’t tell me about that until I asked, and he won’t give me a straight answer The reason I don’t trust him doing that is because in July he was texting a girl from October last year and until July until he got caught, they sent pictures, etc. and he deleted all the messages. I never got to see them and all of a sudden I’m supposed to trust you. I’m hanging out with another woman in another country by himself. Maybe I’m just all in my head. Maybe it’s just me overreacting. Now on my insecure person and selfish, etc. he made me a little insecure by breaking my trust. Apparently she’s a childhood friend. I know his mom knows her but honestly, it just still makes me feel some type of way.