What do you think about me asking to return a gift to my ex?
I guess that depends on the reason. What's the gift?
A cap she made me when she knew I was in love with her.
If it was a gift, whoever got it should keep it. Asking for it to be returned after a breakup seems petty and resentful.
I loved her.
That's the point! Even though you're no longer together, you should honor the relationship you had. Move on.