My LDR boyfriend had frequently texted his exes/ flings during our relationship, it supposedly stopped but im having second thoughts?

Hey so, I’ve been in a LD relationship. At the earlier stages of the relationship, I noticed he would text/ send snaps to his exes every other day. At the time I didn’t tell him it bothered me directly but it was very obvious. I thought I could handle it. Sometime recently, a girl he had a fling with and used to “have a huge crush on” slid up on his story. (Let’s just say if it were up to him, they would’ve been together still). It was a post of me and she stated she was just in the area for the event we were at. I didn’t expect this to trigger me as I thought it was disrespectful for him to reply while we were still out together. Yet, message her often. I told him how much it bothered me that he not only texted her but also texted a couple other flings/ exes. It was getting overwhelming. He assured me that they stopped texting weeks ago and offered to show me/ unadd her. I said I trusted him and he didn’t have to. It’s just something I won’t tolerate and now he knows that. Im flying myself and my family out for our families to meet next month. I thought I got over it but the insecurity of having to ask him to even cut ties is still in the back of my mind. I keep seeing “you shouldn’t have to ask for him to do this in the first place” post making me overthink. As well as the trip being soon. I just don’t want to bring my family out there just for it to end. I will honestly break it off if I see another snap/ text from any of them. I already checked in with him before buying the tickets but I feel like bringing my family out is a huge step for something that bothered me so recently. I really don’t want to bring this up again. Can I get a new/fresh perspective on this?
My LDR boyfriend had frequently texted his exes/ flings during our relationship, it supposedly stopped but im having second thoughts?
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