Do guys ignore female colleagues?

There’s a guy at work. Before I went on maternity leave he used to speak to me a lot. Since Iv been back his been a bit odd. One minute he will speak to me. The next he will walk passed me and ignore me. Is this something guys do?

I have never had an argument with him or anything. I have seen him laughing and joking with other female colleagues. Am I being paranoid?

Do guys ignore female colleagues?
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