Feeling emotional and I don't know why

I feel like I'm losing it or something. I have been emotional lately and cranky. Lately I feel like my fiancé is showing less interest in me. I mean I know we been together almost 6 years,have a kid together and both work tons of hours so our relationship isn't gonna be like a new one and normally it never ever bothers me but for like the past week little things he says or does is upsetting not even making me mad I just feel like it bugs me then I wanna cry. He really isn't even acting any different. What the heck is wrong with me!!