How are things going with you and your girl Jazbo?
Id have to agree that it is a rule you shouldnt break...
Although, from what youre saying, your friend seems to be more jealous of you and how far you got with this girl, than of the fact that it is actually his ex who you are going out with
Has he ever said how much he actually liked her?
You dont have to answer if you dont want to!
Anyway, I hope things go well for you!