I met a coworker at a bar and I said "I saw you last week at the gas station".
He replied with "I have seen you too but didn't want to bother you."
Why didn't he use "I saw you too..."?
The word saw is used when the speaker is talking about themselves or something like that, as in: Hey, I saw you at that rock concert last night. Have seen can be used for multiple things, as in: I have seen you several times at school. Saw would be used when talking about one thing. But they both can be used for single or plural things. Also, saw would be used when you are talking about a time period that has finished. Have seen is used when the time period is not over. As in: I saw three movies last week. I have seen three movies this week.