I’m confused

Me and my boyfriend live together. We just recently moved into our own apartment after living in a rent house with roommates.

Now the problem:

I think I’m gay.

We’ve actually looked into getting a girlfriend for us and I’m actually talking to someone right now. But the thing is, I remember hours I felt when he texted me when we started talking and.....it’s nothing like how I feel now. I feel giddy and childish. I find myself wanting to talk to her all the time and I don’t know what this is. I’ve dated girls before and actually believed I was gay. I fell in love with my best friend. I dated his girl for 6 months and she meant the absolute world to me. I’ve never felt that way about anyone. I don’t know I feel like a horrible person. See I know I love my boyfriend but I don’t think it’s in a lovers way. Just please help me out.