Dont regret her, just forget her.
Bro, you will always be the bad guy in her story.
Don't blame her for disappointing you, blame yourself for expecting too much from her.
Realize that you are perfectly fine without the things you thought you needed the most.
The right people in the right moment will enter your life and never leave, while the wrong people will leave.
Learn the hard truth of walking away.
If someone has hurt you in the past that does not mean that you should hurt another human being believing that everyone else will be bad.
Be smart with your empathy , share your empathy with the right people.
You are responsible for your happiness, do not allow people to dictate your moods.
Accept the situation and move on.