can an 18 boy date 21girl?

hello im from cambodian i wanted to write in thai too but my PC doesnt have thai keyboard lets be serious .
im 21 and i had a crush on a boy who is 18 yearsold before we often chat to each other once we have big argue we never chat again ,but he always watch my story and react heart on my post is it possible ? i just missed him and want us to be back like before again its all my fault hes really good to me he take care of me when im drunk and we know each other only 2days he bought green tea even his home is too far from my work place hes always say sorry to me even if hes not wrong someone help