I was in this situation exactly (minus the hours and hours),except it was my boyfriend that was slinking his snake after I fell asleep! I caught him OFTEN,and wasn’t uptight about him doing it,just that it would wake me up and as an insomniac,it’d take hours to fall back asleep! So I went down the same path of telling him its nothing to be ashamed of,just do it elsewhere or less “enthusiastically”,and he denied it every time too! Between the lying,him gaslighting me,and the sleepless nights,it ruined us! And to beat it all (no pun intended),when we had our last fight about it,he then offers this up: “My doctor says I have a chemical in my brain that makes me hyper sexual !” Too little,too late dude,AND WTF DIDNT YOU SAY THAT THE FIRST TIME YOU WOKE ME UP WITH IT?