I just wanted to put a spin on this.

Being good at relationships also means, one knows when to stop flogging a dead horse.
My father's divorce from his first wife (before my mother).
Was very amicable, in fact they were very good friends right up until he died. However they were I'll suited as partners, after the 10 year mark.

They simply grew different interests, politics and social ideals. More significantly, they were NO longer attracted to each other, at all. And for both of them this was important.

It maybe from them that I came to believe not all relationships are meant to last forever, at least not in a fixed form. That it is possible to simply out grow someone and no amount of work will fit a square peg in a round hole.

Maybe give the power to your T and imagine that it wasn't necessarily the heart breaking affair we assume, but perhaps a life affirming one.

Just a thought. I do hope you feel ok soon, take your time to absorb the news. And how it effected you. Hopefully finding a positive in it somewhere.
All the best take care.