I've not had any problems as such, but when it comes to the woman you want to be with, you need to make yourself happy, you have already given enough information in my opinion to indicate that your mother is not receptive to change.

I would call her up explain how I feel, and if it leads to disruptive conversation end the call, then let her be the one that has to call you if she wants to talk. If and when she calls if it leads to drama again, explain you are happy with your woman and life and she has to just accept that, then end the call again.

Sorry if this is not helpful, but you'll have a long unhappy life alone
if you continue to let your mother dictate your life , in my opinion.