How to be sure if i am bi?

I have a boyfriend but we both think im bi and I look at girls a lot and hes cool wid it but im still not sure if I am I've dont it with one girl but I was drunk what I can rember of it it was fun..

There is such a thing as Bi-Curious. This may just be a phase that your going through and I wouldn't come to any definite conclusions. Just be with whatever sex you feel most comfortable with. If you happen to be into both guys and girls after trial and error (excluding the use of alcohol), then you can be sure. Your still young and theres a load of experimenting ahead for you.

Till you will not try to make sex with an other girl all questions are only guessing. The prove of the pudding is the eating.

well see I check out girls but I cant image my self doing that with another girl.but being drunk is fun in general so I don't know. =) test when your not drunk mayebe?