She's had six "serious" relationships which all included sex and love and living together. In short, she isn't fit for love and marriage. She is what most of us realize is a short-term whore. Most single women over 25 are exactly this; they want to have lots of sexual experience and worship the low-life guys. Of course, they are always on the lookout for the "save for later" guys; you know, the ones who are faithful and decent, and most of all earn a decent salary.
Don't be the last sex partner in a very long line. Think of it this way; would you propose to a woman who had just fucked an entire football team? That's about the amount of sexual experience most single women have had. Unless you meet a woman from a very traditional society or religious group, they are pretty much used up prostitutes by age 30. It's sad, but that's the way it is in Western society.