Is this something to be concerned about?

So i'm a little bit attracted to my best friend (guy). I've openly told him this, i'm not crushing on him but there's attraction in a non-friendly way. I have a boyfriend and I love and care for him deeply but lately i've felt like we've become a little distant, like i'm more upset around him and stuff but he's not making me sad because he's the one that always cheers me up. Anyway i've noticed my best friend and me being really playful lately almost in a flirty sense. He hasn't tried to break me and my boyfriend up and wouldn't cross the line unless I did but i'm not sure if it's a good thing.
Is this something to be concerned about?
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