If he's a momma's boy who cares what his mom or family for that matter thinks about his relationships then I wouldn't get serious with him. I would detach myself, lick my wounds, and move on to other things. If he's not a momma's boy then you will have to accept the fact their will be turbolence in your relationship by the lack of acceptance you will face.
How can she enforce that? If you both have phones, it seems likely that you'll both get away with texting and calling whenever she isn't around.<br />
Does she have a good reason for not wanting you two to talk or is she just one of those crazy mother types?
Kill the mother.