My mom uses things against me?

Whenever we have an argument she always used things that i told her against me. For example if i say me and my boyfriend had a fight she'll be really sympathetic at the time but next time if she's upset she'll be like "no wonder your boyfriend always fights with you, you're annoying" etc. I basically can't tell her personal things anymore because she'll just use them against me or mock me. I can't trust my own mother.

Why does she do this? i just dont understand. I would never use personal things against her.
My mom uses things against me?
Post Opinion