Accept the situation and try to move on
Most people stay in denial and lash out at everyone and everything that tries to make them see sense.
Rejection can be extremely painful since trust once broken can affect a person very deeply. In times like these, never try to stay alone to solve the problem by yourself.
A good way to deal with a heartache is to be in the comfort of the people who truly cherish and care for you, unconditionally.
Talking things out with your friends or family instead of trying to think through the situation countless times by yourself may actually help you feel lighter on the inside.
You could try alternate methods such as writing, listening to music, going out for long walks to clear your head to feel infinitely better.