The gum around my bottom left molar is loose. i can pull the gum away from the tooth a little. is this bad?

Not good..: May be periodontitis. You will need to see a local dentist for treatment. The sooner you call the sooner you have a chance to save your teeth. Hard to say over the internet how dire the situation is.

See your dentist: Have your dentist check it out. It could be an infection or any number of things. Best to have a professional verify what is going on. Best of luck :)