1) STOP + TO + VERB = To STOP + DOING another action.

I met Brian in the street, so I stopped  to  talk to him.


2) STOP + VERB-ing = To STOP DOING an action.

I saw Brian in the street when I was with Claire and I stopped talking.


3) STOP someone FROM doing something = To PREVENT someone FROM doing something.

Claire stopped me (from) talking to him.


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