<human>: Condense the text into a few key points

Title pretty much says it. We were together for 4 years and broke up about 3 weeks ago. We're still friendly and it was a clean break but have gone no contact for a while. I thought i deleted all of her friends on social media (exactly to avoid this problem) but I guess I missed one and saw a snap on her friends story of her talking to a guy. I know the break up is best and I thought I had moved on because the relationship had already been over for a while and I have honestly gone out on a couple dates the last week. However, I cant stop thinking about this since I saw it and its killing. Logically, I know this is really dumb, but we all know how strong feelings can be even when you dont want them. What do I do?
<bot>: saw my ex gf of 4 years talking to another guy, cant stop thinking about it even though I thought I moved on.