Should I continue to live near my parents?

I moved across the country four years ago to be closer to my parents because my Mother is ill and I don't know how many more years we'll have together. It's great being able to visit whenever we want. The issue is that I met a man I can imagine making a happy life with, and he lives in another country. If I move to be closer to him, I'll miss out on the last years with my Mother. If I stay where I am, I'll potentially miss out on a great relationship, and I think those are very hard to come by. I don't think he would move closer to me due to the nature of his work.