Promises

I have been in a serious relationship with my boyfriend for almost a year now. We both started our careers in New York almost two years ago now. We have both traveled several times to visit each other's family across the country, and I most recently went home with him for Thanksgiving. He has been telling me he is in love with me since about four months into our relationship, and I am in love with him too. We have been having sex since around the same time. I am very commited to our relationship, and he wants me to be all in. I am afraid of giving that much to him though.  I want to ask him to decide if he wants to work toward a point where we could get married in a couple of years, and if he doesn't, then I want him to break up with me. I am not sure if this is a reasonable thing to ask, but he knows me better than anyone so I feel like he should know if he wants that with me. I just don't want to give my entire self to this relationship and then find out in two years that I am not someone he intends to marry. I am not asking him to marry me right now, but I want him to commit to that being his intention in the future of our relationship. I never wanted to get married before I met him, but he is my best friend. I am so happy with him, and I would love to begin working toward that goal with him. Is it okay to ask him to make that decision? If he didn't want that with me, I would just ask him to be my friend. I love him, and I still want him in my life. I just don't want to be invested in a serious relationship that isn't going anywhere. How would you phrase that in conversation?