You either get bitter or you get better. It’s that simple. You either take what has been dealt to you and allow it to make you a better person, or you allow it to tear you down. The choice does not belong to fate, it belongs to you.
Keep it to yourself - I think that all depends on whom you vent to. It's actually healthy to release bitter thoughts and feelings to gain clarity. I would suggest to simply be careful whom you choose to trust.
13 Bitter Quotes For The Jerk Who Broke Your Heart
You are responsible for your behavior no matter what you have been through or are currently going through. If you use your situation as an excuse to mistreat others, you're shallow, completely self-absorbed & bitter.