Pls read the full and then give your valuable opinions?

prefernotto
My girlfriend and I are in a long-distance relationship. And we both love each other, and I truly trust her that she will never cheat me.

So there's this guy who sometimes works with her (depending on the duty and timing). And he has told her once that he has a crush on her. She has clearly told him that he should not have any hopes because he is in a relationship. And they somehow end up as friends, when I talked to her about this before, she told me that now I have clearly told him that we can be friends and not more than that. She and him talk normally like friends when they meet.
Yesterday, when she posted a picture of her with her sister on insta, he texted her that she is looking like aunty and see how elegant her sister looks and how she looks, just like an aunty. He even said that when he saw you in the pic, he told her she was looking good until he saw her sister. She was sad and was about to delete the pics, but I talked her out of that, by saying that what other thinks or says dosnt matter and for me you look gorgeous and for your family you are gorgeous and what he thinks should not matter.
Today at the lunch time she told me that she is going out in KFC, I said, "Oh, it's nice, finally "his friends name" will get the treat he was looking for. At that time, she told me that she was going out with that guy only. I responded with that, like, seriously? With that guy who said all those things to you yesterday, even as a joke, but still.. and she responded that it's okay, I don't mind that now, and she wanted to go to KFC anyways (she told me yesterday that she was craving for KFC yesterday only).

I don't know if I should be sad or mad at her for going out with someone who once used to have a crush on her and also with someone who said all those things.
I seriously don't know how to respond to this situation anymore.
Pls read the full and then give your valuable opinions?
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