Try learning a completely new technique like sweeping or tapping.
Learn some new scales. Get a multitrack for your computer and experiment on harmonies. Buy a multieffects pedal and experiment.

If you still don't feel like playing, don't sweat it. If it's meant to be it'll happen.
I've quit several times and still go through periods where I don't play for months at a time. I pawned my guitar and amp for 2 years once cause I got tired of not making any progress. The positive side is that when I got it back I had renewed energy and had actually learned a lot by just listening for a change.

If you never go back to it, you'll know fer sure that you're not really interested.