If the genders were reversed in this story it would be interesting to read the comments. Double standards, indeed!
"What happened between Eric and I was probably just a misunderstanding." That is an understatement. You weren't communicating at all. Which means you don't know anything about him. Which means that filling in the blanks (his version of monogamy, etc) is disingenuous.
You have no idea if Eric was feeling possessive! Why did you go there? Filling in the blanks. What gives you the right?
This seems to be more about you projecting onto men that explaining what actually happened.