I took this girl I'm seeing out for her birthday last night for a couple of drinks before going back to her place. I've been seeing her for a few months now and have spent quite a few nights sleeping at hers and she has confirmed to me that I'm the guy she's had the most sex with in her life.

At some point last night I mentioned the fact that I had spent a couple of nights in a hotel with a girl and that I was planning a lad's holiday with a couple of friends in the future. I mentioned Amsterdam and and she said in a weird way "Yeah that would be good for drugs and sex, good for a guy's holiday" - comfort test? She refused to talk about what was wrong.

But after I mentioned these things she suddenly became extremely cold - keeping her head turned away, not talking much if at all, very negative body language. We left and went back to hers after one drink. I went to bed with her but just wasn't in the mood for sex at all with how miserable she was being. Asked her to cheer up and ended up getting pissed, getting dressed and driving home.

This morning I get a text from her apologising, saying she got jealous, got mad at herself for being jealous, but thanked me for taking her out.

The thing is, last week she seemed to indicate she was happy keeping things casual between us when I brought up the fact we'd been sleeping together for a while (made a post about it). Which is why I'm wondering if this is some sort of red flag.

Is this a case of her developing feelings for me? Or does she want commitment from me while keeping the door open for fresh cock?