sex and boyfriend

my boyfriend and I have been together since July. He moved in around August, we were so in love with each other he kinda just never left. we work together. we live together. we sleep together. we do everything together. and I love that but we get stuck in ruts. I just want some of the passion we use to have. we've had our trials, and we've always gotten through it together. I just want to spice it up, we are young. I already feel married. I don't want to feel so stale, I wanna feel fireworks. Any advise? or am I just over thinking it?