It’s sounds bad but hear me out. I have a cat called Boris, he’s very loving and sweet. He’s a shoulder cat constantly on my back but.. the thing is I can’t be in a room on my own without him howling like I’ve left forever. I go to the toilet he has to be there, I go to bed, he has to be there etc... is this an abandonment issue? I mean this isn’t meowing, this will carry on for hours and it sounds like a baby crying... I’ve had many kittens/cats through out my life and they’ve never been this attached.