I don't honestly get the question. Why are you asking it? Are you interested in saving the relationship? If yes, then you gotta talk talk talk to the other party. If you want explanations... eh, relationships don't often end up for reasons listed in DSM.

Labels? If I went through full eval, I personally would end with more labels then a label-maker It doesn't matter that much because for each person it's different.

As for symptoms? I always have "symptoms" on the spiritual/existential scale.... and rather internal.