I completely understand where you are coming from. I am 24, about to be 25. My ex and I were together for just about 5 years when he told me he wanted to go “live life”. I of course was devastated and heartbroken and told him I wanted to live life with him but that’s not what HE wanted. I was mad at him for a bit but grew to learn he had every right to pursue his happiness. My point is, don’t feel guilty about wanting to begin your own life journey. He will be sad for a little while, as will you but like bruises,they heal even when it hurts really bad at the moment.He will be ok and will accept your decision with time, and will begin his own adventures.