i met him at a social event. he seemed like a nice person and at the same acting reserved. as he didnt ask for my no i'd guess he didnt interested, however, after weeks passed, i bumped into him wif a girl. i assumed she is his gf. decided to back off. then, things started to take a twist when we kept unaccidentally/accidentally bump into each other. sometimes he treated me well, sometimes he being cold to me. i was confused with my own feelings. do i really liked him? do i have to do something?