He's being a concerned son. Having a mother try to commit suicide has got to be terrifying for him. You should have some compassion for his situation. Instead of demanding that he answer your emails and come to visit you, this is the time to tell him to spend time with his mom and take care of his family problems. The reason you should tell him that is because if he's a decent guy, that's what he's going to do anyway.
Timing is everything in relationships.
For a relationship to work out, a man has to be available and commitment-minded. Your fella is neither. And it may take some time before he's ready for a girlfriend. A man whose mother is suicidal is bound to have some residual problems from living with a disturbed mom. You shouldn't worry about whether you had anything to do with his mom's suicide attempt.