So my ex (M36) and I (F36) got divorced almost 11 years ago. We have one son together who will start high school next year. My ex also has 3 kids with his new wife.

A little back story. I have bipolar 1 disorder. I am fully medicated and go to my psychiatrist and therapist monthly, but I still need help with hospitalizations sometimes. My ex never supported me in the marriage and always told me to just "get over" the bipolar. He is a narcissist and just not a nice person.

In 2015 I had to get help for my depression twice. They were very short stays. I just needed help to deal with the divorce transition and being in college. I didn't tell him because I didn't want any issues with custody. Somehow he found out and took me to court. We had originally 50/50 custody.

When we went to court, he made it seem like I was the most unstable person that exists, and his lawyer even said I could possibly unalive myself and take my son with me. My brother passed in 2013 from that, so I have vowed to never do that to my mom again. My case wasn't strong enough and I lost custody. Now I have a standard possession with a few extra dinners here and there.

I have fought ever since then to try and get my time back, but his lawyer is a shark and has made me look bad, even though I now have to have proof that I am seeing a therapist and psychiatrist. Nothing is ever good enough and judges and mediators tend to side with the non mentally ill parent.

So here's where my post title comes in. I want to talk to my ex about college because it's 4 years away and I don't want to have to get loans. I don't feel like I should have to pay half of his tuition since I have had about 40% custody for about 7-8 years now. I don't want it to be a threat like give me more custody or I wont pay, but I also truly feel like he should pay more for college.

Also, I pay him child support every month, and he makes more money than my husband and I make. So WIBTA for telling him I'm not willing to pay half.

Edit: I understand I WBTA, so I am so happy I asked here instead being dumb and having that conversation with my ex. I appreciate all the advice and also appreciate the negative because it keeps me in check. I am going to save everything I can for him and just see what happens. I have 22K in student loans and I don't want him to have any.