Untrustworthy woman

Have you ever just had a gut feeling about someone? My husbands friends girlfriend is one of those woman. Like every part of me wants nothing to do with her or have her in my home. It sounds so petty I know. I don’t get this way towards other woman, I get along with everyone. I just can’t explain why I feel this way. (I don’t suspect my husband has anything with her at all. I truly trust him)