I ended this 20+ year relationship for a variety of reasons in autumn last year but we have stayed in touch and met up occasionally for a drink/chat. No interest whatsoever of getting back with this guy as a partner. We have chatted by text this week, as he has been supporting his friend (who I know) who has marriage problems and a very ill brother in hospital.
Ex rang me on landline tonight which is at the top of the landing (long saga; new broadband had to be fed through the upstairs wall). My youngest cat, who's only a baby (and Siamese so a bit of a showoff), was pirouetting on the banister and newel post and I was worried she'd fall, flail and scratch me so I told her to get down - twice as she jumped up and did it again. He mimicked me talking to the cat and said I should have taken the call away from the cat. Not possible given he rang me on the landline and she has an obsession with the phone when it rings.
Then he said that he rang on the landline because I failed to answer my mobile, and on checking there was no call from him since the weekend. Texted him and told him that later. He swore that he had rung me, and I told him again no, he hadn't, I'd checked my call lists. Went to bed.
The landline rang again and it was him telling me I was disturbing him reading in bed and yes he had called me, and texted me, and I was boring him. (He had been drinking). And the book was boring him too. I ended the call as I was beyond bored.
I'm not asking for advice, probably just sharing how weird this behaviour is. I tried to work him out for years in the last few years of my relationship with him and gave up as a bad job.