What advice can I give my sis?

I love my sis to death, I am at my wits end in advice for her lately..She has been single now for about 4 years and she is 30. She has a son that is young, and she is a very successful beautiful outgoing woman, so finding a man is never a problem..the problem lies with her never being satisfied with her mate..It seems that she will find any reason to stop talking to the guy after while.She is very picky and I cant get her to understand that no one is perfect. What advice can you give a person who can't seem to be please by any potential man, but wants love so bad? Just when I think se is working it out and happy with a guy, she calls me and tells me why she is no longer interested in that guy..Something as simple as the way he cuts his food will irritate her..What advice would you give to her, because I think Ive said it all..thanks people