Am I wrong to be bothered by my man chatting with many women on socials including ones he slept with?

So we are dating for 7 months and I am very bothered by the fact that he is still texting other women that are not his friends but some girls he just knows. I don't understand the motive to keep them around if in a relationship.

He is convincing me it's innocent and that it's not flirting and it's just exchanging a few texts now and then but I still don't see the point and it's making me uncomfortable. I am wrong to feel that way?
Am I wrong to be bothered by my man chatting with many women on socials including ones he slept with?
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