Her birthday: he buys her a $400 gift. His birthday: she gives him a bj

On my gf's birthday I gave her a necklace that I spent $400 on. I wasn't expecting her to spend the same as me, but I was expecting something.

Here's how it went down. After dinner she asked me if I was ready for my gift, I said yes and she started giving me oral. She doesn't like giving oral and I'm ok with it. She was giving bad oral and honestly I just wanted her to stop, then she gets up and pulls me into my room and we have sex.

I feel disappointed. I don't think sex is a gift. I didn't expect a gift that was equal to what I spent, but I wanted a least something.