Why did my Girlfriend tell me she met a guy friend at work and told me not to be insecure about it?

My girlfriend knows my ex wife cheated on me with her male co worker and I told her everything that happened , so she knows I have a hard time accepting friends of the opposite sex when I am in a relationship , out of respect for my relationship with her , I don’t go hang out with other girls and would never hang out with other girls without her present she agreed to this when we started dating out of respect for each other, now recently she started a new job that she doesn’t really care for , She was telling me all about her day on how everyone was an asshole but she is going to stick it out because the money is good , I tried making love to her and she denied my advances toward her and said she wasn’t in the mood , then she continues to tell me , I don’t want you to be mad but I met a friend at work , I said ok that’s cool and she said but it’s a male , he was the only one that really talked to me and understood my frustrations, I said ok that’s cool and you are telling me this why? And she said because I know you have a hard time with opposite sex friends , I said only if you plan on hanging out with this guy outside of work , I was kind of dumbfounded as to why she said this to me as I was trying to be intimate with her and her denying me? How would you feel if your partner said this to you and denying you affection and intimacy? Is she hinting to me that she likes this guy and probably going to end up hooking up with him or trying to make me jealous? What was her real reason of telling me about this guy?
Why did my Girlfriend tell me she met a guy friend at work and told me not to be insecure about it?
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