I 18F am worried about my relationship w my bf 20M because of college

So basically I’m about to finish my freshman year of college. I have a boyfriend of 2 years who I love deeply. He’s the sweetest person ever and has always been such a good boyfriend to me.

I love him so much and see a future with him, but sometimes I wonder what my college experience would be like if I were single. I don’t mean this in a sleeping around with people way, I mean it in a way where I would find out more about myself.

He’s my first and only boyfriend, so I don’t know much about dating outside of him. A couple months ago a girl had a crush on me. I innocently flirted back in a friend way, but then reconsidered these actions because I realized that I was actually becoming curious about my sexuality. I felt so guilty for flirting even if it was joking, but wondered how the situation would’ve been different if I were single. I obviously didn’t want her, but I thought about how I probably would have been able to learn more about myself through her if I didn’t have a boyfriend.

I feel so guilty for feeling anything other than assurance and clarity when it comes to him, and I don’t know what to do. Is it normal to have these feelings? Does it mean he’s not the one for me? What should be my next step?

I realize that college is a time where you figure things out about yourself, but I don’t like these thoughts and feelings that are coming up. It’s so new and scary to me. I love my boyfriend so much and I hate how I’m thinking this way sometimes.