You need to overcome your own insecurities (with respect). Your girlfriend has a past with other guys, messaging other guys and having sex with other guys comes as part of that package. You can either see that as a weakness because you've not had past experiences as well, or embrace it as a strength, clearly your girlfriend must have a great personality or looks (or both!) to have such a history. The book, from an objective perspective is fine, people like to remember their pasts because for the most part, it is those experiences that factor into their confidence/worldview today. The messages, mainly the question as to why she still has them, is somewhat less clear, but even then, so long as she only has them because she genuinely doesn't care about them, then that's perfectly ordinary too. The issue here is firmly on your hands and it seems that your girlfriend has taken steps to help alleviate these fears (albiet by validating them and making you feel like you're right to feel this way) but honestly, you just need to tackle them and accept that she has a past, everyone has a past, hers just includes other dicks. Now unless, one of those dicks is one of your friends or relatives, there really isn't any reason to see it as anything more than nothing. Finally, just to help you a little, everyone goes through this in their first proper relationship. People find it so hard to distinguish between love and sex when all they've experienced is loving sex. Those who have experienced other relationships find it a lot easier to deal with stuff in the past because they themselves have had similiar experiences and recognise it for what it is, just experiences that have no bearing on the current relationship. Put simply, ask yourself this, does her experience directly affect you beyond your judgement of what she has done in the past? It doesn't. Also, she likely agrees 'she was a hoe in the past' but that doesn't mean she actually was, she enjoyed sex has much as the next man. Accept and move on. And do not (I repeat not!) ask anything from her relating to her past, because you're essentially asking her to overcome your jealously/insecurity issues for you, when really you need to tackle them. Much love, dude.