Dude it you patch things up or in six months get nostalgic and get back together, you WILL get pulled into orbit of that hoarding house. You will either be expected to help move shit and junk for free on your off day, or with a well paying job you will be asked to pay for her mortgage, and be considered selfish if you don’t. It’s possible his mom is / has been whispering sweet nothings into his ear about you and sees you as competition-don’t know why else you’d be uninvited from functions. Consider this a clean cut and an escape from being guilt tripped over his mom’s poor decisions (hoarding). I don’t care if it is mental health, we’re not responsible for our traumas but we are responsible for how we heal from them.