Well, I moved within the last few months, and wasn't allowed to take my cats with me, but I always loved having them.
At times when I was at my lowest, I remember them seeming so concerned and purring loudly and nudging me to get me to pet them, to get me to move when I just didn't feel like doing anything.
Honestly, at times it felt like my cats were the only ones in the house who actually cared about me.
I have so many memories of laying in bed feeling terrible or crying or something of that nature, and one of them coming up and laying with me, or rubbing against me. They were always so reassuring to have around when I felt my worst.