I'm getting married in a few months. Right now I'm figuring out the guest list with my fiance. His ex-girlfriend is currently dating one of his friends, and I would prefer not to invite the friend in order to avoid the issue of the ex. My fiance says he should be able to invite his friend regardless or the ex. In my irrational, female way, I cannot get over the fact that she's an ex and do not want her at our wedding. Thoughts? Suggestions?