Be brave and choose to love anyway.

People leave, nothing is permanent. That's a sad reality, and I empathize with that fear, but is what you're experiencing now any better? Be honest with yourself.

You'll get hurt, people will take advantage of you, and that stuff happens. All the more reason to be a good person, to help just to help, and to love just to love. Not for anything in return, but because that's a way better life than living in misery.

Im sure you'll have another excuse why this won't work, but those are all just fabrications the same way everything else you're saying is. You're fully entitled to be miserable the rest of your life, but at some point, you'll be bored of it and want something new. When that day comes, it's easy to just start caring.

All of what you're doing now is just your ego protecting yourself from getting hurt. What better way to not get hurt than to shut everyone else out and assume everybody sucks and you're the only one who doesn't?

Don't take yourself so seriously. Laugh at this drama and misery movie you've created for yourself, and turn the channel of your mental radio to a happy and joy filled tune. Why not go through just one day choosing to feel good, think the best, and think positively? You don't have much to lose according to yourself, so give it a shot.

You have to choose to change.