I do not know if I am bisexual

Hi, I know that the only way to know if I am is by just knowing it in my heart, but I can not tell if I am bi. I have been wondering for a while, and I have a boyfriend whom I love very much, but sometimes I think I like girls too. Personally I do not think I would want to date a girl, but sometimes I think I’d love to have sex with one. I get turned on by girls sometimes like how I do with guys, but I do not know if I am bi. Can you guys help me?