love triangle

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I have a friend who is madly in love with her boyfriend, they have been together for 3 years. Recently he asked her to marry him, she told him yes but she has mixed feelings about whether o rnot she should truly marry him. Her issue is caused by some infedelity on her part. About 6 months ago she cheated on him with one of his friends from his job. They were together a few times and they decided to break it off and not tell her boyfriend anything about it. Now she feels very bad about the whole situation and doesn't know whether she should sweep it under the rug or tell her new fiancee. My suggestion to her was to sweep it under the rug and never speak of it again, although most things done in the dark come to light eventually she is soooo happy when they are together and i believe she truly loves him. He makes her so much happier than i have ever seen her before. Was i wrong in my advice? Am i wrong by not speaking of it to her fiancee since we are also close friends?