Missing my kitties so much

I am having such a hard time. I miss waking up in the mornings and seeing all my girls out there waiting for me to feed them. Yesterday I only saw mama kitty and Maddie and they didn't even come until late at night. I just don't understand after all these years why they are not coming to eat.
I live in a dulpex and new people moved in with a cat, I'm wondering if that cat has claimed this territory and moved them out. It's that porch they were living under. I'm just so upset.