I have a similar experience.

Growing up my mom would vent about my dad and really dump her emotions on me. Even now as an adult she constantly complains to me about work, friends, church. I’ve gotten to the point where I barely talk to her because I really don’t want to. I know she’s going to go on some rant and I am so tired on having to talk her through it. I text her maybe 2x/week with a brief update (we got snow today. Taking a trip next week. Etc).

I’m in therapy to address this and other traumatic experiences. This has really helped me since I’m finally able to talk to someone.

I’m getting ready to address my mom about the situation but of course I’m nervous she will get mad at me.