Do I truly love my boyfriend?

I have been dating my boyfriend for 2 years and 5 months. He is currently a freshman in college and I am a senior in highschool. The long distance relationship has not been too hard for us because we see each other usually once a month. However, there is this guy at my school that I have had a crush on since I was 12 and he never liked me. He has a girlfriend as well and he is suddenly flirting with me a lot, and I secretly am enjoying it. I am committed to my boyfriend, and I don’t understand what’s going on. Help??