<human>: Can you succinctly summarize the text in 1-3 sentences?

My ex bf (23M) of 3 years broke up with me 3 weeks ago. The break up wasn't totally unexpected but I really thought we would work through everything, like we had in the past. Since then my self esteem has been at an all time low and then today I found out that he had already been seeing another girl before we broke up and they are still together. I can't describe the level of heartbreak and betray I am feeling right now. I really thought that we were still going to work things out. To make it worse the girl is a friend of his that I always suspected had a crush on him. I feel like the biggest idiot in the world and just want to crawl into a hole and fade away. I feel completely and utterly worthless in the world and I have no idea how to feel normal ever again.
<bot>: long time bf was seeing another girl before we broke up 3 weeks ago and they are still together. just want to crawl into a hole.