It is easy to allow hatred, pain, and negativity to the harbor in your heart and mind and it is easy quite easy to fester on this and let it control you but the downside to this is that you end up being bitter, you lose yourself to the bad and in doing so you lose the goodness that is within you, the love and cares that you have nurtured over the years.
It is not an easy thing to do this with regards to the opposite of the negative feelings and thoughts etc but is not an impossible task to achieve, if you find love in yourself then you should be able to let the pain and hatred that comes as a result of the betrayal and backstabbing that others do to you, go.
It is going to take time definitely, but the good news here is that time is an ally, if only you would allow it then it would heal all your wounds and until the scars are almost unrecognizable, do not be ashamed of the mistakes you have made along the path to goodness, learning and greatness, learn to be proud of your scars, look back, laugh and smile about those moments.
They are inescapable but then they add up to you becoming who you are today, do not let yourself be damaged as a result of anyone's actions or inactions, words or otherwise. You are beautiful as you are, you are amazing, be proud of yourself, find happiness within, and love yourself more than another would love you so not do not fall when they decide to take their love back.
Remember the only one who cannot disappoint you is you and God, trust the process, the future is going to be exciting...