Is OTHER wrong in the post ? POST : Hello /r/AmITheAsshole,

I am currently having some trouble determining if I would be the asshole in a certain situation and thus deciding what I should do in the situation. First some backstory:

Slightly more than 1 year ago in my second year of uni a friend of mine told me he liked someone in our friend group. So I helped him with advice and my opinion on things (so I have been kinda involved in this). He asked her out but she said 'I have to think about it' and so she did for nearly half a year until he proposed that they would go on a 'trial'date. They did this for about 1.5 months and then they started an actual 'relationship'. This relationship lasted about 2 month before he broke up with her because 'she was spending to little time on me' and 'the relationship didn't turn out as I wanted'.

Since then she has started to flirt with me and I started flirting back and liking her. So recently I started thinking about asking her out but I also realized it might be a very asshole thing to do and I do not want that. But there are two things that made me doubt whether or not I would be the asshole. First of all even though he was the one who ended the relationship he still had emotional trouble but recently (about a month) he started saying that he was over her (I doubt this). Secondly during the half-year 'thinking' period he always said to me that 'he just wants what makes her happy even if that is a relationship with someone else' (which I also doubt).

So here is my question are my doubts of being a asshole coming from a rational place or just from my penis/heart and would I be the asshole if I asked her out (or even worse got asked out by her)?

TL;DR: Friend likes girl. Weird shit for about 2/3 year. 'Relationship' for 2 months until he broke up. Now (about 5 months later) she is flirting with me and I am starting to like back. WIBTA if I asked her on a date?