Is it normal that i found my first love again and still love him?

Hello! my story is a little complicated but here it goes...
ten years ago i met a guy, he was my first love, due to family and economic problems I had to move to live in the us. I was 14. we agreed i was gonna write him as soon as possible; so i did but i never received a reply. the plan was: come to the us and finish high school with the best grades possible so could go back and enroll into med school, meanwhile he was getting through law school. He was 19. I wrote him for two years, a letter per month. never heard from him again until last year. I went to visit my family and saw him in church. He looked exactly the same, well after so long i almost forgot his face but when i saw him i remembered everything. He took me to the place where he kissed me for the first time and went back to that moment. he never received the letters i sent him because my cousin never gave them to him, she thought i needed to concentrate in my studies and continue my education here. I only stayed for a week. we have been talking since but, I can't be so far from him. It's been six months since we saw each other for the last time and I am supposed to go see him again on April. I am 25 years old, and I am a very independent person and know exactly how I feel for him, I love him with all my heart but I've been thinking if can we still have a happy ending? he is now an attorney and I am in med school. we both have what we wanted but in different worlds. My head tells me I have to let him go but just thinking about loosing him again scares me to death. I want to be with him but I cant leave my world and I couldn't ask him to leave his. should I leave everything and follow my heart? for how long should we keep our long distance relationship? should I let him go? if i do, how am I gonna forget him? People PLEASE! what should I do????