She provides you with far more affection than you're used to and had secretly craved. Now that you have this, you fear losing it and are taking at least two approaches. In one approach you're trying to soak up as much of this affection as you can until it's gone. In another approach, you're clinging to her hoping you can keep her from disappearing.
It's kind of like a man who was raised starving his whole life and is suddenly given as much food as he could want at any time he wanted. Much like the man in this example, you'll have to learn to relax. The love will still be there... and you'll survive in case it isn't. You know this because you've grown up in a family with significantly less love. So just enjoy what you have found with her in moderation. Pay more attention to the nice quiet moments and less on the need to bask yourself in her affection like there's no tomorrow.
Slow down and pace yourself... there's no need to rush
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen