How do I explain why it's important to me to say I'm not going to tell my mom how much I appreciate her just to prop up her self worth, when it will just be this same cycle all over again next time?
Hello and welcome to the family! I'm very sorry we're meeting under these circumstances but I'm glad you found us and shared a little bit of your journey.
For your specific example, I would actually take dad's side (even though the basis is 100% off). There's no harm in telling your mom to take a few classes, that she's smart and capable enough to get back in school.
Now, I understand you don't want to because it's not about the topic at hand, it's a 24/7 cesspool of validating needs that are never quite enough.
At their core, BPDs need to feel needed. And almost 100% of your mom's rants aren't over schooling or whatever, they're protests that she's not feeling needed, validated, etc in the moment. He rant over schooling probably has nothing to do with anything and she's probably already forgot about it. Now there's a new pressing need, and tomorrow there will be another.
Here's the thing though, when you "opt out" of that conversation, now you're proving your mom's delusions inside her mind that she's actually not needed or appreciated. So for me, it's easier to just say, "You're smart and capable, go back to college if that's what you need." Because what could she say after that? Either she does it or she doesn't, but it's 100% her fault from that point forward.
Because that's the thing, your mom will never complain about what actually matters. Why? If she said that she didn't feel needed, and you say, "Nope mom, you're not," then that would break her in ways she couldn't recover from. So it's always something else in an attempt to receive that same validation in less healthy ways.
All I can say is God bless your dad. I've been there and I did the same thing, having zero clue what was actually going on (because I was too close to the situation and too all-in on marriage). She ultimately left me in the end to have an affair, so I hope and pray your dad doesn't end up in the same position. I can see so clearly now that I enabled so much and accepted so much that I shouldn't have, but I don't regret it since I did it out of love and faith.
I hope that helps!