Why???

I have no idea why but lately I've become such a softy.. Just out of the blue within the last few months around Decemberish. My boyfriend and I have always have had this joking relationship and he'd tease me and I'd tease back and what not. But lately.. I don't know I've been so emotional with everything. We would tease each other with the most horrid things, and now I catch myself getting so insecure and upset over the littlest things.. I just don't know if this is normal or what but it's driving me absolutely insane.. The worst part is, is that I actually know he's joking and I feel like I bothered him a little when I took offense because out of nowhere I just got upset.. 😔