Friend request from husbands ex? Read description!

My husband and I are working on rebuilding our marriage after a separation and near divorce. (We had the papers and everything, we were just waiting during the required waiting period). During that time my husband spoke with a few other girls. He didn’t go on dates or anything but he did flirt, etc. we were getting a divorce at that point, so I get it. But (long story short), we reconciled, and decided we want to stay together and are seeing a counselor, working together to build up our marriage. Out of the blue two days ago, one of the girls he was speaking to friend requested me on fb- which to me is weird. Why? Part of me is curious and wants to message her and at least ask why because I’m genuinely curious. Part of me says to just reject it and not sweat it. Any suggestions?

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