Boyfriend and crush? What do I do?

I’m almost 15 and in 9th grade and my boyfriend just turned 16 and is in 9th grade also. We have been dating about 6 months. We started as friends and gradually become more, so we are extremely close. He’s super sweet and always find a way to make me smile and laugh. Lately though, I’ve been feeling like we aren’t as close. We haven’t been hanging out that often. Last year we had almost every class together, and now we only have one(not including lunch). Other than school we rarely hang out and he always seems to be busy if I ask him to hang out. Also, he hasn’t been as affectionate towards me lately. Before we would play footsie during class(I know, childish), and hold hands all the time. Now, I’m lucky if I get an arm around me in the hallway. Anyway, all this stuff has made me feel really insecure about our relationship. And recently, I met another kid in one of my classes and it just feels meant to be. He has the same exact taste in music as me, plays guitar(which I play too), has an amazing voice, and is also extremely goofy and sweet. I have no idea what to do! Is having a crush even normal during a relationship? I feel really guilty about it, but also it makes me wonder if I’m really happy with my boyfriend.

I’m so conflicted! Any advice?