Getting depressed to move out from a Breakup

Recently he broke up with me because he couldn't take the load of the relationship. The real reason was I had some minimum expectations from the relationship and initially they were not met ...so out of sadness and anger...i said harsh things to him and hurt him unknowingly...he never said something harshly...but his actions hurt me unknowingly. I always tried to communicate with him about this...but he told to leave these things and don't talk about this. At the end of every argument he said to me to breakup if I want or find someone else this hurt me even more. There were less fights...but whenever it happened...it happened like this.

In between we also had romantic moments for which I thought there were no issue and I was kind of delusional

Since the last fight happened where obv it was my fault...he decided to breakup. I am kinda introvert and when I get close to someone and i get really attached to that person really bad that if that person leaves it hurts my mental health so bad.

If anyone have any suggestion on how to overcome this ...it will be really helpful