For me, podcasts specifically about going to sleep to them trigger my contrariness too much to be actually relaxing. It's gotta be on a normal topic that is just the right balance of interesting, but not exiting/engaging.
History typically scratches that itch for me. Dan Carlin's hardcore history and the history of the English being the two goats that coke immediately to mind. Camp Monsters is also a great one; the rare fiction podcast that I can actually stand, much less relaxes me enough to sleep.
This comment really just hits every nail on the head for me. It could be that the ex is feeling bad for what happened, but wants to divert the blame/bad feelings onto OP.
It's also rich to me when the cheating partner is ready to "put all the bad blood behind them" as if they don't want to live in the stink of what they did any more. They're happy now, why can't you also be happy with them? Etc etc. As if they didn't blow up everyone's life with their choices.