<human>: My GF and I were joking around in bed yesterday, and we were teasing eachother and tickling and laughing. It got to the point where she gets all laughy and adorable, and I just felt so happy to be there with her and so I stop us and get serious for a few seconds, I look her in the eye and I told her with a straight face "I love you".

It's not something I say very often, but she knows I mean it when I do say it. Problem is she found it funny to respond "I don't love you" back. It really put me off any affection for her, I thought about going home at that point but I stayed the night and had some awkward sex later on. This morning I couldn't help but feel completely unattracted to her and just told her I was going home.

It's like the one thing you don't joke about like that, I just immediately felt like shit. Is that super weird? I just feel like she did it to purposely play with my emotions for really no reason at all.

We have both said "I love you" a few times before (certain times when you just feel it, you know?), I can't tell if part of her meant it or if she's just fucking with me, or if she was just joking, even though she swore she didn't mean it afterwards. She says she does love me and she didn't mean it, but she also said she knew I was being totally serious when I told her I love her.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Girlfriend found it amusing to tell me she didn't love me, just to mess with my head, swears she didn't mean it.