Can the dumpee ever really be friends with the dumper?

I know the dumper can (and will often try) to be friends with the dumpee but can it ever work the other way around? For me despite when all feelings are gone, the fact that I was not good enough for them always hangs over the relationship. Whether or not I was is irrelevant, the fact is at one point they felt this which is why I see it impossible to ever regain a real friendship again?
Can the dumpee ever really be friends with the dumper?
Post Opinion