Advice needed

So I’m a 26M and was dating a 26F for about two years. When things are good they are good. However, she has extreme trust issues due to her father leaving her years ago. I’ve tried to suggest she seek out therapy . She never opens up about herself and stuffs a lot. She doesn’t really have true friends she can express her feelings too. She drinks heavily on the weekends and becomes extremely emotional and mean. I know I can’t fix her but sometimes my heart breaks for her when thinking about that girl that got left behind by her dad. We are currently not dating but we still talk often, whenever she acts toxic and mean, i often let it go and accept her apology. I’m starting to think I’m enabling her by thinking it’s ok to act that way. She’s smart, pretty, driven and motivated but lacks emotional connection and trust. I want to be with her but not this way. Should I pull back from her and let her really figure herself out? I feel I’ve become toxic too due to her behavior.