Is this the same man your mom was apprehensive about? Could it be that as a parent she senses that there is no future with this man as he isn’t a good choice for you?

If a person doesn’t want a relationship with you it doesn’t matter why: is it a broken leg or depression or busy at work. You can’t force them be with you no matter how much you are there for them. You can keep in touch of course but I’d not waste time waiting. I think you can do better.