I say forget about your Mothers opinion for a bit and look at whats best for the burm, and you.
If you WILL be moving around, and think you cannot provide a proper home for him then it would obviously be better for you to try and find a good premanent home for him.
But if you really are starting to like him, and you will commit to taking on the responsibility of caring for him moving or no, then your mother will just have to deal with it.
My point is, this situation only has two factors that matter....the burm and your ability to care for it. Not your mother
Good luck making a choice, I hope its the right one for you.