Why Did I Cry My Eyes Out So Hard?!

I just moved into an apartment with my boyfriend. We've been moved in for a week as of today. He brought his dog with him but I had to leave my kitten at home with my parents. We took his dog to the park today. He was so happy playing with him and throwing the ball. I instantly started balling my eyes out because I missed my kitten emma. Oh and my period ended yesterday and I cried AFTER my week was over...... why!!!!