I think you definitely have a poor understanding of the relationship. Usually there almost never are enough reasons that even live in diferent continents to be with each other. Love trumps all. Add laws in nations that allow marriage based immigration this really should not be an issue at all.
You need to first figure that out. Also keep in mind that if a person says it's too painful to be friends it they may not necessarily tell the truth. Not everyone is confrontational and not everyone will be honest to tell you that they do not want you in their life anymore.
You will heal from this, I am aware how bad really close relationships can be when you rely on each other for emotional support to solve problems and when that's gone it's like the rug is pulled from undeer you feet and you are left hanging in the air. Disoriented. Scared. Angry. Not knowing what to do, what to think, what to feel. Hopefully you will come out of this hurt as a stronger person.