Signs?

So my boyfriend and i have been together for 5 months. We literally can finish each other’s sentences and we know each other like the back of our hands. We are super bonded and he’s literally like the male version of me. Yesterday, we were at an amusement park and we heard a song from a singer that we both LOVE but he’s really not popular at all. I’ve never heard any of his songs anywhere except for at that place where we both were together. Is that weird or am I just overthinking it?