Friendship or Love Relationship?

Hello, i want to tell my relationship that i have been observed and want to know your opinions. Please let me know. Thank you.

i have a 2 years best friend. At first, he made a really bad impression to me. But, we suddenly become close because of the all of classes we took in college 90% same. We sudeenly made a team to join a competition and i was the one who ask him without any other intention beside to win. We really become closer after join the competition because i know all of his weakness through the journey.

My mixed feeling starts there. I never made an effort to close to him. He was the one who tells me all his story from the private things about his family to the unimportant things like the people he saw a moment ago. So, i also tell him my story.

The special case here that he is emotionally unstable and i am the one who deal with it everytime he is in his weak side beside his mother. He often tell me what he feel without being asked. He let me know his worse condition.

He helped me with my tasks in college when i got super busy. We even have the same dream and plan together about the organization in college. That moment, i know i began to have feeling toward him because he really know how my feeling and my habbit. But i dont want a relationship with him to avoid being unprofessional in works and i still dont know how his feeling toward me. I chose to just let it be.

At a time, i went overseas for a week and leave him struggle with the job we did together. I always asked about how can i help through chat but he said to focus on my trip. In my way to back home, he often ask my position and condition. Untill i met him, he still acted like he is okay althought i know that he was not okay. Suddenly, he told me that he was stressed when i left him. He didnt know what is this but he became overly sensitive with other people. I was surprised, Because i was just trying to move on. So, i jokely asked him if he missed me, he was just quite and smile awkwardly.

I know that i still like him and hard to make a gap with him because the project we had. I adore him and want to close with him every time. Do you think he likes me now or not?

What should i do to move on when we really together all the time. Even people out there always asked if we develop romantic relationship.

Addition:
He is nice to everyone and have some girl best friends from his high school.