Heartbroken that ex-gf found someone new

We've been broken up for close to three months now. I don't know if that time is too soon or not but I'm really bothered that my ex-girlfriend seems to have found someone new now. Some foreign guy. I didn't get any confirmation about this news yet. I just saw this mutual friend of ours sharing an Insta story that had my ex-girlfriend on it. She was cheering on someone on the first story and on the next they were looking cozy with that someone while having coffee post run. I don't recognize that "someone as a part of her circle of friends. That's why I assumed it could be her new beau. I'm really heartbroken seeing her move on that quick. Was our 3 years really that easy to forget?