How to not be bothered by a guy I was seeing now having a girlfriend?

Anonymous
So I was seeing this guy at the end of last year and it went on for around 5 months. It was my first time going on dates, my first kiss, etc and I was really into him. He seemed really interested in me as well and said stuff about wanting to meet my parents and go to future things together so naturally I presumed it was heading towards having a relationship. Anyways, he stopped making an effort and it got to a point where it was literally just me trying to keep things going. I got tired of it (after a good months effort tbf) so stopped being the first one to reach out and didn't hear from him which hurt tbh. (Also, worth noting we work together - big mistake I know - so it's not like he wasn't seeing me).

Anyways, yesterday I found out he now has a girlfriend. I thought I was over it and not interested in him anymore but tbh it shattered me; probably even more so when I found out they had been seeing each for less time than we had. I'm confused why I feel like this; I feel like I wasn't good enough and I just want it to not bother me. Luckily I'm leaving my work soon due to getting a job elsewhere so I only need to put with seeing him a little bit more til I can completely eradicate him from my life.

But does anyone have any advice on how to not let this bother me or get over it? And dating tips which could help me for this kind of thing in the future?
How to not be bothered by a guy I was seeing now having a girlfriend?
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