I'm so sad....

My guy bestie and I used to have sex on occasion. It got less and less often but we talk all day. We haven't had sex in a year. He's extremely busy with work and sex isn't a priority to him. I actually help him with work too. I have kids from a previous relationship. He does not. Most days he wants a family of his own. Some days he says he doesn't have time and unsure he wants kids of his own. I can't give him that. He recently got asked out by a woman and asked me how I felt about it. He doesn't want to hurt me and says if I am hurt he won't go out with her. I don't want to stand in his way of being happy and possibly starting a family. I am crushed though! I opened my heart and told him EVERYTHING. How can he not be intimate with me after everything I've done for him? I help him to relieve some stress so we can be intimate again. He's told me "I never said I don't want to be with you. It's just not on my mind". Damn, a year though?!! I know where he is most of the time. It's not someone else's bed. He's very unemotional person. I'm crushed bc I do love him and want to make love to him. How can he say it's not a priority but make time for someone else? I understand the clock is ticking and he wants to find someone sooner rather than later to start a family with. I just don't know what to do. He's told me numerous times he doesn't want to hurt me and he won't date of it does.