AITA for feeling upset about my ex's involvement with my friend ?

AITA for this ? this seem wrong.
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[@aum1040]

You are allowed to feel hurt. But you didn't actually have an agreement because an agreement requires both parties to have a meeting of the minds (i.e. agree about what was agreed). You should not expect anyone but yourself to be upset that he didn't honor an agreement that he doesn't think he made. This is mostly a you issue. Since you aren't dating him, you need to move on for him. Planing on dating people in the future is just a bad idea.
If you feel you need to, you are allowed to tell him that after careful thought, you feel betrayed and you are ending your friendship with him. This isn't an overreaction. you are entitled to feel however you feel. Insulting or screaming or retaliating would be an overreaction.