Questioning sexuality

I'm 23. I've been with my boyfriend for a year next month. I've made out with girls a few times drunk and sober. I do love a good pussy pounding from the D. But I can't help but wonder what it would be like to date a woman. I'm 5'9 and really attracted to girls shorter than me. Sometimes when I hug some of my friends I wish it could be something more. Sometimes I fantasize about a 3 way just so I'd be able to fuck a woman and to even just kiss a girl again. I love my boyfriend, we live together and have two cats together. But I check out other women more than he does. Sometimes the way I dress my friends joke and say I'd make a good masculine partner and I honestly think I'd love it. I don't know what to do.