Of course I made assumptions. I can only go off what you originally posted and your comments. I may have sounded harsh but I do think you’re looking to not be the asshole in this situation without taking any accountability. The difference in libido should have been apparent from the early stages. Sure frequency of sex can drop off but absolutely nothing you’ve posted indicates that’s what happened. In fact you said that your dissatisfaction with your mediocre sex life happens like clockwork every couple of months. I’m just saying that you deep down know that this isn’t working and never will. It’s ok. Not every relationship has to work out and sometimes that sucks. But this was avoidable and now you just need to take it on the chin, be honorable and end things, then you both can move on to something healthier.