I proposed to my best friend (guy)

guys what should I do ???

so we met around 5 years ago and since then we have been friends, we share the same birthday, we live 2 mins away from each other and ... I've had feelings for him since long but , it was like I and off like one day I have a strong attraction towards him and the next gone but since Jan it's gotten strong and after two weeks of overthinking I finally gathered up the courage and told him hey umm I used to like u and his face went serious for a nanosecond before he said oh my god and was nervously laughing and kinda looking like he expected Itt and after he said oh my god he just gave me his cycle and walked away *did I mention he was riding his cycle and stopped at the sight of me* and after that he avoided eye contact but still talked to me and when I called him later to clarify he cut the call