Help!! Advice really needed!

So this guy he and I worked together before he moved and we talked all the time like 24/7 and we talked about dating and I really liked him. After things happened in my family he was the only person who could make me laugh like he could or make me smile and feel alive and me in a few years. So he moves and we are still talking and FaceTiming and everything is great. We start getting to really know each other then getting closer. So we are sexting all the time and its so nice. We try to hang out every break he has when he is back home never works out. Tried to hang out at a hotel or my car nothing works. So I go for a college tour and we see each other and right before I see him he wants to keep it casual. I agree and maybe one day we can still date, I’m such a girl I actually thought that. We hang out and then everything stays the same sexting and talking a lot sending pics all the time. I realized Ioved him. Something about him I can’t get over. We are so similar. He is become a doctor I am Pre-Med, same religion everything. So eventually he stops replying to most of the pics I sent him usually I would get the reaction I want from him then it changes. I know he talks and hang out with other girls that’s the point of keeping it casual. I understand I can’t give him all he needs not living close enough to him if we dated. We tried hanging out two weeks ago and didn’t work out and now he won’t text back at all. It’s been since been a week and a half that’s the longest I haven’t talked to him since I have know him about a year. I miss him so much and nothing is the same if I can’t at least talk to him. I can’t move on from him. I gave him my heart and so much more because I cared about him then loved him and he liked me to but didn’t love me, he never allowed himself to. How do you move on if you never dated but still love him and he was everything to you for that time and can’t move past the memories in your head and I can’t go a day without being reminded on him constantly. Thanks for the advice and help!