Hw cn u tel tat me and my bf is nt having jst a physical attraction but true love?

Me and bf since 4yrs..but v usd to speak mre abt sex thn anything else..but nt had any sex til nw..though v hav kisd many times..my bf is mre into these kind of things and i found it normal bcoz i think boys r lik tat..tel me things which cn diferentiate love and physicals?