Advice on wife and coworker

My wife and I went through some relationship issues a few months back. We communicated well through it, got to the bottom of it, and have been working together to fix it. Things with us have been great, but all of a sudden I am hearing her mention a guy from work more. I found out for Secret Santa last year she bought him cologne. He now refers to himself as English Leather when he talks to her. I let her know I thought cologne was a bit too personal a gift for a male coworker but I understood that she just thought it to be a funny gift, after all it is English Leather. The next day after this conversation, she asks if it was ok if over the summer she takes our kids over to his place to use their pool. They are both teachers with summers off. I explained to her that I would not be thrilled at work all day knowing my wife is hanging out with another man in her bathing suit all day. I asked her if she would be happy with me doing the same and she says she understands. The next day, this guy calls her at home during the dinner hour to ask her advice on something. I don't want to come off as controlling, but this is starting to seem as though he is trying to start moving in on my wife. any thoughts?

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