How do I get over my failed talking stage?

Anonymous

Basically there is this guy that I’ve met in uni a few months ago. We used to talk every day and meet up almost every day for two-three weeks, until he started becoming more distant meaning he started replying to me less frequently and wasn’t willing to meet up with me as much as he used to before. He sometimes or oftentimes cancelled on me last minute or just straight up ghosted me for the whole day so I did assume he was no longer interested. We did still talk often so I was okay with being just friends with him until I found out he was talking to another girl almost at the same time. What hurt me a lot is that he actually took his time and effort to get on a train to a different city just to visit that girl when he didn’t even care about me and our plans. That is when I decided to cut him off and I did, and we haven’t talked ever since then (it has been around 2 Months now)

and I’ve just found out that he is in a relationship with the same girl now. Although I’ve tried to distract myself and convince myself not to care about him as I have no right / reason to, I still do and it still saddens me so much for some reason. he and I live in the same accommodation (that is also how we got to know each other) so I’m always scared of running into him

I can't comprehend why I am this much attached to him when I’ve only known him for 4 months. Plus we never dated or anything of that sort so I have no right to be sad over his love life. I’m so afraid I won’t get over him for the rest of the year

Updates
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I just don’t understand how can a guy who I've only known for 4 months without dating hurt me more than my ex boyfriend who I dated for three years
How do I get over my failed talking stage?
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