Phil,
Give it some time. You don't want to be the rebound guy. That usually doesn't work out too well. After some time has passed, if you are still interested in persuing this girl, have a talk with your friend first. I'm not saying you have to ask his permission (as it is not his to give, it's hers), but don't blindside him by asking her out without at least having the courtesy to let him know your feelings.
And to answer your question...No, you are not bad!!
<3
Nikki