Unconditional love can definitely exist. My grandfather was a perfect example of this.

Had plenty of money to put my grandma in home, but instead took care of her himself until his kids forced him to get help. At which point he just bought an in-house nurse service.

My grandpa isn't the most emotional person. He doesn't show affection. But for my grandma, it seems there was no way he would ever let her go without being the one to take care of her for years. Cut her food, feed her, clean her, take her to the bathroom. It was truly beautiful all he did for her.

As to a comment below, expectations in a relationship are healthy. You go into a relationship with someone based on the things about them. Though, you don't choose a cowboy expecting them to be a city boy.

But you choose someone like you, set up guidelines and expectations, and talk and communicate throughout the relationship. You bend and be flexible for the other, you love them and respect there different ideas.

You stay youself, and share yourself.