I'm worried she's bored... Poor kitty when I come home she meows in a way like she's saying 'how could you leave me that long?'
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It's likely a mix of both. She's 'trained you' (which really means you've taught her without meaning to), and she was probably bored and is glad to see you.
I always greet my cats when I come home, walking around to each kitty and giving them a pet and saying Hi to them. Partly it's me making sure they're all home (I do this before I leave the house too, but saying goobye and telling them to be good), and partly it's just me being glad to see them again. I don't see anything wrong with a small greeting.
However, there's a lot of possibility for this behavior to get worse. This is what I'd do. When you come home say hello to her briefly (a small pat, and a meow rather than a 'hello' if you'd rather

), then ignore her for a bit until she settles down. If you're consistent this will teach her that you missed her, but it's not polite for her to yell at you (which is what she's doing!) until she gets attention.
Once she settles you can go ahead and play with her, in fact it would be perfect for you to make a fuss over her as soon as she's settled down. Don't get her all riled up again, but let her know that a quieter, more polite, greeting will get your attention faster than being a pest does.
My cat meows a lot when I don't know where she is. She stops when I say something to her. She never did that when I had other cats, so I wonder if being the only cat has something to do with it. She is spayed and does not go outside. Dry food is available 24/7. The meowing started after her friend died and we moved in December, so I know age is irrelevant. Any ideas?
Emily, she's probably lonely, but age might be a factor as well. I've heard that some cats meow loudly to themselves as they get older, sometimes calling for a sibling or family member that has passed quite a while ago, and sometimes just yelling. I'd suggest starting your own thread since you'll get more, and better, replies for your specific case that way
