Before you make any long term decision, wait for her to graduate, find a job and be independent. Right now you're helping her financially, and that ought to feel good for you right? Really good.. knowing that you're helping someone in need. A damsell in distress even. In your mind, you're saving her from being a prostitute and putting her through school.

This dynamic is making you feel all sorts of positive emotions that you're naturally attaching to her. This is giving you extra fondness, care, and protectiveness to her. But those feelings may go away once this dynamic ends and you're no longer supporting her. When you're no longer "saving" her.

Also, keep in mind that you're an old dude and she's a young girl. She may only be using you for your money. Once she no longer needs your money, you may get your heart broken.