sticky situation

Have you ever been in a situation where you don't want to pick sides but you have a strong opinion on them both. Well that happened to me. Jillian decided that she is going to get married to this guy that looks like a troll. I didn't want to hurt her feelings and tell her that I don't think that he is the right guy for her. But then I don't want to make a sticky situation that can be avoided. If people didn't care then it would be so much easier to help someone out if they didn't take it so personal. I want to be able to help her but I don't know how to tell her. HELP!!!!!