Hey pajamazzon, how are you with him? How are your behaviours towards him right now? Have you, or anything else what you used to do, changed recently & he has picked up on this & maybe responding in the same way back to you.
Maybe there might be an issue whereas, HE doesn't trust you any more & this is how he is responding!
Well that's all about you, but maybe it is HE who is bored of routine, maybe he does have a problem, but never the less we all are affected by emotional mishaps in our time, especially in relationships that's just the way it is, so maybe there is now reason to blame yourself at all.
My advice if you don't mind listening: Don't jump to any more conclusions, until you both make the arrangement to sit down quietly & COMMUNICATE each & every single doubt on your mind, get it all out & find out what he now wan't as we all change being together & don't always grow towards the same direction. But first off. Look inside yourself & find out what YOU want!