I think that given what you’ve written, you’re letting your imagination run wild. If she was really having an affair, I don’t think she’d tell you that there’s a rumor in her office that she’s having an affair. In addition to which her actually telling you this is a way of sharing with you what’s going on in her office. Instead of feeling uncomfortable, why don’t you ask her how that makes her feel, knowing that rumor is going around? Being apart for the three weeks she’s working out of town separates the two of you. Your job now is to re-build intimacy and your relationship. Focus on what you do know — that she’s home; she’s given you no reason to think she’s anyone’s but yours, and she’s sharing things with you.
I hope that helps.
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