@FlowerandSun - I could have written much of your post myself, (word for word), as my STBXH said exactly the same things, like:
"We have nothing in common anymore" - we do have things tho, I sat and wrote a list, and there were loads of things!
"Something's missing/wrong" - this gives them a really good way to get you trying really hard to 'be better', without knowing what the actual problem is exactly. Like you said, organising date nights etc - nothing ever seems to be good enough. I ended up tying myself up in knots, trying to meet his 'expectations', but always managed to somehow fall short... I didn't notice a huge amount of effort on his part though... and it's no good if only one partner is doing all of the trying...
Becoming distant - yes, mine was definitely doing this, and for the last few months before we split, I began to wonder if there was someone else (it has happened before, and his behaviour towards me was feeling very similar to how it had been when that happened).
We're trying to stay amicable, and we were having a cup of tea together recently, when he decided to tell me, that he has realised that ALL of his depression, has been caused by our relationship! (Nice).
This, is despite the fact that he was on anti-depressants before we even met each other (23 years ago).
Then, a few days later, he was asking if there was any chance of a reconciliation.
A few days after that, he said to me that "by setting him free/letting him go, that I had given him the best gift I could have ever given him, because he was so unhappy in our relationship" 😦.
But at the beginning of the year, he had given me an eternity ring??...
He actually dumped me over the phone, after 23 years together (married for 18).
A few weeks later I told him that I agreed, (in the kindest way that I could).
His behaviour since then, has been erratic to say the least...