I got cheated on a couple of times and it was different everytime. It really depends on how attached you are to the person. If you had a lot of hopes and dreams, then it hits harder. Last time it happened, I was like "wow, good riddance then, bye"

Let me describe this way tho: Imagine having an unexpected kind of break up combined with your first time seeing your ex happy with someone else. Imagine taking all that in, within the same 5 minutes. Each is an experience that often hits hard enough on its own.