How would i know if my boyfriend's love for me is real?

i have a bf for 15months now,i just met him online & we hav'nt met in person yet due to some reasons.but we are planning to be together soon & get married.he's 10years ahead of me & he's a mature person ready for a lifetime commitment.anyway,i used to joke that it'll be okay with me if he'll have dates there since i cannot be there yet.he's work is stressing him & though he denies it,i know he needs to unwind.although we talk so much online & in phone,spend hours on cam,we enjoy,love & respect eachother,i know he needs more than just that..2months ago,he asked me if it would be fine with me he starts seeing girls just to meet his needs in the meantime & so i gave him my blessing but with a condition.that he should be seeing lots of girls to avoid falling for another girl & so he did.but lately,he's only seeing this particular girl.the woman's aware about me & that she's only a buddy for him.in fairness with my boyfriend,he makes sure that he spends more time with me..