Did you do any rehab after the tweak? Sounds like your hip flexors might be weak. Get strong and this should go away. If not, seek medical attention.
I was instructed to exercise..Since i go to the gym 3-4 times a week, i initially focused on strengthening the surrounding muscles of my knee. But maybe i just need to keep it up? I thought i might be doing something wrong (ie, body positioning, etc.)