Theres this cut or scrape on my gums and behind my teeth its become swollen hurt to touch does this mean its infected????

Maybe/not. If you cut it there will be a body response and some inflammation. The saliva has some antibacterial effect and many such issues self heal. It may be true gingivitis and deserving of treatment. Your dentist or general doc can confirm this during a consult.

Lots of options, but all require an exam and xrays to verify the cause. Visit a dentist asap!

You may irritated the area by biting on a bone or a hard piece of food, or using a hard toothbrush. Gum disease could be present, either way a dentist should be seen for exam and x-rays. Don't try to treat this problem yourself. If infected you would see pus.

These may be associated or may be 2 separate but coincidental problems. You will have to be examined to be diagnosed. Please call your General Den list or a gum/bone specialist, a Periodontist.