My friend seems to be interested in my ex, what should I do?

Ok so I (29m) have an ex I'm close friends with (25f). I was hanging my friend (28m) and we discussed women we were seeing and I mentioned my ex is coming to visit me, he wanted to see what she looked like so I showed him a picture of her. She is pretty attractive and he instantly seemed interested and even asked if I'd get him her number. I felt awkward and said "I don't know" and have been thinking about what I should do next. My ex is single and so is he, he does see women off places like tinder though, he mostly just dates rather than has relationships. I think he wants me to hook him up with her.

My friend seems to be interested in my ex, what should I do?
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