I had sex with my then girlfriend the same day I broke up with her.
Why did you have sex with her knowing you're going to break up with her?
There were several good reasons: we were both crazy about each other and I wanted to fuck her until I die and I was convinced that she wanted me as well.
If you are crazy for one another then why break up with her? It's bad to play with someone's feeling and I would recommend you talk with her sincerely if it's still possible to make things right with her and continue with the relationship.
I had no choice. It wasn't in my hands, why can't you understand this.
It sounds like there was a lot on your plate and that you shouldn't have broken up with her. Your relationship sounded really nice, so having sex before breaking up sounds quite mean. Do you think you can try to make up with her?