i like a girl?

Im 20.. and always been with men, never liked a girl in my life. ive recently met a girl who i, somehow really like. She is a lesbian, and knows im straight. And we recently went out to a bar together just us, and got talking and things got deep and we both really understood each others mindsets. we just get on really well and understand each other. I dont understand what this means, like, i cant stop thinking about her...