I felt the urge to get validation for my significant other and then we got into a fight because she refused to validate me.
Why would you go your way to seek validation?
Because I've been feeling worthless and I just needed words of encouragement.
It is too bad that your significant other said such hurtful things to you. If that is a normal occurrence, you should consider whether the relationship is healthy for you. It is bad for a partner to disparage their loved ones.
Well I can't be expected to deal with my significant other being in a bad mood. She always makes nasty calls like that. I can't just sit back and accept insults like that.
If this is ongoing in your relationship, and it's simply a toxic relationship. If you're willing to try to make it work I would recommend seeking couples therapy.