We are not the roles we assume. Roles are like jobs that can be replaced. People are not their roles of being a spouse, lover... Although the world assumes this is true and react accordingly.
Once I open myself to being intimate with someone else and grow to love them, from that point on it doesn't matter what they do next. I will always love them wherever they go. They must work hard to injure and destroy that love of mine - unintentional injury doesn't count.
If enough time has gone by, that can't be done completely - unless they intentionally and willfully work pointedly to do so. Even then, the time we spent when we were in harmony is always mine should I choose to keep it for myself. In time, I may find someone else to craft an alliance with that is more appropriate to needs, but that second person is not a "replacement" for the first. If we part, nobody can ever hold the same connection we shared because it was and is still unique. With each connection, (believing that great relationships are made and not found) I have been indissolubly changed by my experience of intimacy with them. In knowing them. It is as if I grow appendages that are uniquely shaped just for their connection of holding hands with me.
At least, that's my experience so far.