<human>: We came into a really deep phone conversation late last night after I had found out she changed her facebook status to "singe" because she was irritated with me that I had talked about how hard being in a relationship sometimes is and wanted to know if we would work out long term.

I didnt break up with her, but was irritated with some of her actions recently and I wanted to explain it to her, and I couldnt understand how a) she interpreted as a break up and b) didnt make any attempt to clarify it or try and fix it. She just quickly transitioned from this idea of being in a relationship to being single.

In the middle of the conversation, she admitted to me that even though we both have made these very solid, very real plans together in terms of living, career, and travel she has always had a "Plan B" just in case we didnt work out. 

Its a very logical thing on paper, but to me it also implies that she has no faith in the relationship and needs to this detailed plan in case we dont work out. Its as if she almost expects this, and so she refuses to emotionally put both feet in our situation, needing to keep that door open just enough to escape it at any moment when she sees fit. I mean, I know we're not married or anything, but we've talked seriously about marriage already and I cant imagine how a husband might feel if he found out his wife had a plan of how to lead her life in case they got divorced.

Am I wrong?

Can you summarize the given text in a few sentences?
<bot>: After recent argument, girlfriend admitted she had a Plan B ready to go if our very serious, long-term relationship fails.