<human>: I met my girlfriend about 4 months ago and we've been a couple for a little bit over a month now. During this period we've been very happy with eachother and only recently have we hit our first bump.

She is a flight attendant and she recently met a coworker in one of her flights. They went out together for lunch during the day she was spending in another country, however, they ended up spending over 10 hours together. They exchanged numbers and he is now constantly flirting with her, sending her slightly inappropiate texts. They also took several photos in which they were hugging. She has already made it clear to him that she has a boyfriend and that she is not interested in pursuing a relationship with him, however, she isn't cutting contact with him despite the fact he continues flirting with her daily. When she came back she told me how enjoyable their time together was and that she would like to spend more time with him in the future. He even asked her if she could give him her new work schedule so that he could adjust his own flights so they could travel together from now on. She told me all this as if it was completely normal, even showing me the texts they exchanged and the pictures they took together.

She doesn't consider her coworker's attitude as an issue at all, she claims he has no intentions whatsoever to escalate their friendship but after seeing those texts and photos I just cannot comprehend how she arrived at this conclusion. I trust her but it makes me feel extremely uncomfortable to know that this coworker is constantly attempting to escalate things with her. I have already talked to her about my feelings and thoughts on this situation and I've even given her some examples in which our roles were reversed and she said she wouldn't enjoy it either. Despite this she still refuses to see this as a problem and won't set boundaries they also keep texting.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: girlfriend met a coworker on a trip, they started texting and he is constantly attempting to flirt with her despite knowing she has a boyfriend already. Talked with her about it but the situation hasn't changed yet