I'm going to ask my boyfriend to return my valentine's day gift
Why wouldn't you do it yourself?
I'm so fucking annoyed with the store staff, who can be so rude.
I'm sorry they treat you that way.  I'm sure your SO will be more than happy to help you out seeing as you hate going in there.  Hopefully he finds something better for you this time around!
Yeah, he better buy something expensive for me or I'm going to dump him.
Isn't it even more important that he puts thought into the gift, regardless of the cost? He might think you only care about money and he might not want to continue the relationship if he hears you say that you expect an expensive gift from him.