<human>: Can you condense the text into a few key points?

Basically I've been getting close to a friend of mine that I've known only casually for years. We both have admitted to liking one another and we spend quite a bit of time with each other throughout the week. We've already had the discussion about whether we should get into a relationship or not because she has some insecurities about leaving her boyfriend (they've been dating for three years) as well as some doubts about whether it would work or not with us. She's waiting on making a decision because of some personal stuff at the moment but I'm wondering if there is anything important I should know about getting into a relationship with this girl? It also feels like because we're good friends we'd go straight into girlfriend/boyfriend status rather than starting with a couple of dates. I have to admit that I don't like the fact that I am coming between two people but to be honest their relationship is pretty screwed up at the moment (serious trust issues relating to several infidelities). 

My own insecurities rest in the fact that she has much more experience with this than I do and that she probably will have to be a little patient with me while I adjust. Any advice on how to make this work? I thought maybe giving her some time after she breaks up with her boyfriend might be a good idea but then again, that just means more waiting.
<bot>: Friend of mine might be getting out of a long term relationship to be with me, tips on how not to fuck this up for someone who has never been in a long term relationship?