Why men often mention their girlfriend when talking to me?

What are your reasons for slipping it into the conversation unwarranted? It’s not a problem for men to mention their girlfriends but I do feel a pang of rejection as if they want me to know they are taken even though I’m not hitting on them... I’ve been single for 8 months just out of a 5 year relationship and maybe I’m just irrationally sensitive right now. What do you think?
Why men often mention their girlfriend when talking to me?
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