Spinning thoughts

I've been ruminating about something that happened between me and a girl about 4 months ago. Long story short, she tried to manipulate me to get me to want her more. I've since realised that it was a control issue on her part, and I have realised what the deal was. But during the past week or so I've confided in a friend, and I feel like he thinks I'm obsessing over the situation too much. He's a nice guy and a good friend, so I don't think he's judged me at all. But how do I stop worrying about it!?