It may be true that you have been treated unfairly and you are a victim. But you are more than a victim. You are a complete, vibrant person who can make choices about what happens now and what will happen in the future. Balance your complaints with how you are going to move forward. Your friends understand that what happened was unfair, but they need to hear how you can rise above being a victim. You can say, "I know he treated me unfairly, but I am going to take control of my life."
Next: If you talk about problems, talk about solutions