Eddie was driving that other day when he noticed a car was following his every move.
When it first started happening, he thought it may be a coincidence, but wanted to be cautious. He started observing the situation and the car more closely. The car didn't have lights on the top, so he knew it wasn't a cop. He decided to go out of his way to make a right turn, and the car followed suit. That was the point Eddie truly believed this car was following him. He started to think that maybe he accidentally upset someone and this was going to be a road rage incident, or this person was going to rob him whenever he finally parked.
Eddie had his phone ready to call someone, but he was not prepared for an altercation to happen, that was the last thing he wanted. His next move was to pull into a neighborhood without a signal to try to throw them off, but then they pulled in the neighborhood behind him. He took a left, and the car followed suit. His last ditch effort was to pull into a cul-de-sac because a car certainly wouldn't follow him in there unless they meant to. That's when the car continued past the cul-de-sac and parked in a driveway. Eddie thought the person was just throwing him off, but he drove by the car and saw the person lock their car, and walk inside the house.
This incident turned out to be purely coincidental, but a little too close for comfort for Eddie's liking. Amy was proud of him for being aware of his surroundings, but the guys on the show gave him a hard time for thinking someone was following him.