Why does my puppy cry when I leave him alone?

You need to respect his decision, regardless of how you feel. Accept your friend status and be patient. Perhaps his feelings will change over time.

Contact law enforcement to get him to stop harassing you.

Tell him to stop immediately. If he doesn't, call the police and seek a restraining order.

If you feel suspicious about your partner, get access to their cellphone and look at every activity on their phone.

If he's an older cat, then get him checked by a vet in case he has a health problem that's waking him. If he's fit and healthy, then it could...

You could start training him now by getting him accustomed to having weight on his back, basically turning him into a pack-steer. But, he won't be ready to actually ride...

He's worried about you. Don't tell him you're fine; every man/boy knows that when you say, "I'm fine," you're not tell him how you really feel.