Different stages of life (reason for breakup)

My bf of the past 14 months broke up with me this Monday. We were 10.5 years apart. I did not see it coming. He has two daughters (19 & recently 18) and they are both adults now. He cited the reason we should part ways was he didn't know what the future held for us.He said he loves me very much and cares about me and that the last 14 months were the best time of his life. He had put his desire of starring in musicals on hold for the past 20 years to raise a family and he was so self-less, worried about making others happy. He now wants to pursue his dream.I knew about that because he talked about it all the time and I said I'd support him, I'd be his biggest fan. He was worried I'd resent him for starring in shows at night (he works full-time as a dean) and he didn't want that. I told him that I had my own sh*t to take care of (I'm launching a clothing company later this month) and that he needn't worry. We can work it out because we both love each other very much.He said we are at different stages in our lives and that I'm perfect for him, but just not right now. I eventually got it out of him that he wanted to see other people. We were such opposites and he wasn't sure about that. During that 14 months together we never fought although we did frustrate each other. I thought we were both mature enough that we worked thru everything. I'm 36, btw. He also said that he was worried that breaking up with me would be the biggest mistake of his life. He also mentioned that he might be knocking on my door in a few months.We were each others' first boyfriends. He wanted to remain friends and I tried for a few days, but it was too much. We had spent almost everyday together since we started dating and shared our lives. We'd text constantly and call constantly. I eventually said I can't do it.I miss him so much. I had to cut off all contact with him because it was too hard. What makes it worse is I had just moved to the area when we started dating and knew no one. We met online when I was still living 1.5 hours away. I have a few friends now, but he was my best friend. To be here now and not have anyone I can really turn to makes the loneliness more noticeable.I had those same doubts that he did about us being opposites and I made the decision a while ago to commit to him and not wonder who else could be out there for me. What hurts is that he loved me so much, yet not enough to try and work thru the uncertainty of the future as a couple. That's what relationships are for, right?Maybe someone could shed some light on why you'd break up with someone that you are so in love with.