<human>: Can you condense the text into three sentences or less?

I have been dating my girlfriend for two and a half years, and I've run into a problem that is really bothering me.

Every time we have an argument, she immediately goes to her friends (or whomever she is with at the time) and vents about it, basically portraying me as this horrible person.  The only time she goes to them is when we have a problem, so I'm being painted in this negative light, and instead of working with me to solve the problem, she relies on what they say.

When I tell her that this method of coping bothers me, as it is coming at my expense,  she tells me that "all girls do it, it's the way she is, it's unfair for me to ask her to change how she deals with emotions".

Am I in the wrong here? Are there other methods of dealing with emotions that I can suggest to her that don't involve her throwing me under the bus and turning her friends against me? Any advice would be appreciated, as it's created a huge rift in our relationship.
<bot>: Girlfriend complains to her friends about me when we have an argument to let off steam, ends up making me look like a horrible person