Hi, first, women do not ejaculate, men do, women have orgasms, so I don't understand what you mean she stopped ejaculating.
I think the best way to find out what's going on with her is to communicate with her. Talk to her about your concerns and ask her if there is something that you can do to make sure she is being satisfied. Also, there could be a medical problem. I was in a similar situation and it turn out to be a tumor in my uterus, followed by major surgery. I couldn't feel a thing and it caused great concern at the time. He thought that I was no longer in love with him, didn't want him, but it turned out to be a health issue.
Communicate your concern and wait to make decisions after you get a response. Good luck!
My best advice to you would be to talk to your partner about your feelings in regard to what's going on in lue of the sex life you once shared and now seems to have vanished. I hope this works out for you and your best interest. Always try and keep in mind that sometimes, we must keep ourselves at top priority.