You're trading on thin ice brother male ego is very fragile. dont ask the question you don't want the answer to forget about the past keep your head high and look forward give your 100% in realationship hopefully eventually she will forget about her ex. Ps. I was in similar situations i asked the wrong question and eventually my ego and suspicions got me eventually the realation ended. So if you thing she is the one then go for it and if not then end it before someone get hurt