A feeling of ill will or resentment is one that we all will have against people or an person that has hurt or harmed us; physically, mentally and/or emotionally. Not because we are ignorant, but because the pain that we've had to endure of their careless behavior has now become a matter of consistent suffering. After feeling like your worth nothing more than to be happy, you start to hold grudges against them, because it makes you feel better. And that you are hurting them back, just as they did you.
Grudges are held in many forms, but all have no positive gains for us. We may think that not talking to someone, calling them names, physically abusing them, stealing their personal property or being obnoxious is going to work but all of those acts only send small proportions of the point that we're trying to get across. For one your mad that your not worth being treated with respect and second, your hurt for being betrayed. As much as we want to resent even placing these people in our lives, we have to be strong and overcome them.
1. Don't look back
You cannot progress in your life, if you are looking back at the past. The people you meet, in which you regret should be a lesson learned, and nothing more. Same goes for the bad decisions you've made.
2. Believe in "better" things
People improve their life every single day, simply because they believe that they deserve to live better. If you cannot believe in better for yourself, then you must not in anyone else. Believe in yourself first, then accepting the wrongdoing of others will come merciful, because you know you are worth better no matter what happened in the past.
3. Be realistic with yourself
You can be the generous person someone may know, but that doesn't mean they will appreciate you for being so. The bottom line is that not everyone believes in respect or even have the dignity to respect themselves.
4. Don't question yourself
After events happen, our mind start questioning whether it was something that we did to provoke or escalate the situation, but most times it's not your fault. Don't blame yourself for what someone else has done to you. It's surely not your responsibility to constitute for others' actions or bad decisions.
You may get an apology, and you may not. Whether you do or not, be willing to compromise it so you can move on with your life. Don't wait for someone to realize their ignorance, or you will always be miserable.
You are a great person; don't let the ignorance of others say otherwise!