I hate to say it, but I think that folks have taken advantage of “be patient of folks with trauma/mental illness/etc.” and turned it into “you HAVE to put up with me or else you’re an asshole who is insensitive to those with struggles.” And nobody wants to be “the guy who wasn’t supportive enough”.
It’s okay to break up with someone if you are too overwhelmed by their needs, regardless of their trauma/mental illness. Staying will make both people absolutely miserable in the long run.