How to get my.soon to.be 1yr old off the boob

Hello! I have exclusively breastfed my son for a year (in two weeks when he turns 1). No bottles, no pacifies and have only used a soft top sippy cup for.him to have water that he only chews.on. He eats food and all that but getting.him to drink out of his cup is a battle, we tried to do bottles when he was younger but he refused. Now that he is about to be a year old with some teeth im wanting him to go primarily to his cup but he doesnt seem to understand he can drink from it or just doesnt want to. Even now he only gets boob 5 times a day max, mostly as a comfort and.before sleep thing. How can i correct this and get him drinking from his cup?? How do i stop breastfeeding him if thats all he wants? I want to be able to leave him overnight at his grandparents, mostly for a much needed date night with my husband as we havent been out just us since he was born which we dont mind but we REALLY just need to have some 'us' time, but with him not taking bottles or cups we cant leave him for more than an hour. So please..give me all of your tips and tricks and help this mama figure this out because i have absolutely no idea what to do from here. Picture of my little baby mans because hes the best thing in the whole world