how do bạn know hes the one?

bạn don't. bạn have to be able to put your self out there and if there is a spark...... Thats when bạn start to explore your realtionship and know it the person who looks at bạn with tình yêu and is willing to tell bạn when your wrong and praise bạn when your right! the one that is always there for bạn and never gives up!!! That what i think anyway!!