Trigger warning Red flags gas lighting

Trigger warning
Do you think it’s a red flag :triangular_flag_on_post:
My husbands ex girlfriend tried committing suicide. Ended up hospitalized. She is diagnosed bipolar and ptsd. I met him only a few months after I was 16 turning 17 he 31. He hid and lied a lot in the beginning. I now see red flags all over looking back and wondering if he played a part in her feeling that way. Could his gaslighting and manipulation have cause her to do so? He will say something then few days later say he never said it or twist what he originally said.makes me feel bad about little things like going out, will say it’s ok then next day ignore and have attitude all day and I find myself anxious trying to fix it? Whatever that is. Has anyone been in similar situations or am I over thinking things?