OP, it sounds like you are young? Always let the man make the moves. A woman who chases after a man looks needy and desperate. I wouldn't stop talking to him, just be normal to him, treat him as a friend. All good relationships last the longest and are the healthiest that are grounded in friendship. Baby steps, be his friend. Its as simple as a smile in the elevator and wishing him a wonderful weekend.

You need to establish trust with him then your friendship can flourish and then who knows