Well, pot is illegal in Belize...
The golden rule among travelers is to try to live by the rules and laws in the countries you visit. At least it'll keep you out of most trouble.
Buying pot from an unknown just to keep him from coming back? Well, that is not necessarily a smart move.

I don't know the place you stayed at, but I do know that we have all kinds of people on the island. I also know that this is generally one of the friendliest places one can go to.

Just remember that this is still planet Earth, and that there are good and bad things out there.
I have lived here permanently for five years, and I was offered more drugs during a three days visit to Houston than I have been offered here.

I am truly sorry that you had a bad experience, but if a Belizean break the law in the U.S. or Canada they cannot just walk away with a $US 150 fine like you did.

I am glad that you got away without any more trouble.

Remember, there are three sides to every story.