Did I do the right thing by not saying anything?

Before I was in this awkward situation, this guy at work started acting strange, crush or what ever on me. I was not single. I would not say anything about it, afraid my boyfriend would find out and get effected by it. Was this the right way to handle it? A part of me is having doubt it was, another part of me think I did the right thing.

Did I do the right thing by not saying anything?
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