My BFF is getting married and I don’t know how to feel about it. Should I tell her the truth ?

sorry for the mistakes and the length English is not my 1st language 😅

I have been friends with this girl for a decade. We both consider ourselves sisters. I have seen her suffer in many relationships and was really happy when she met her future husband 3 years ago.

At the beginning of their relationship, my best friend's mother was against this couple. In fact, we come from Ivory Coast but are French citizens, her fiancé’s living there though.

Over time they developed a long distance relationship so the mom thought the fiancé wasn't honest and just saw the girlfriend as a "passport to Europe" 😪

I always believed in this couple. However, my husband and I discovered and noticed some shady things about him. For example my girlfriend could go 9 months without seeing him and he swore he wasn't seeing anyone else but we resorted to him dating a girl there. He denied it and she believed it. She saw text messages, photos... but still believed everything he said and let that go.

The last straw was when at my wedding in Ivory Coast 2 months ago, he lied to her saying that he was going to see my husband and convinced my friend not to tell me. When my husband showed me the evidences he advised me not to tell her, which I did. But ever since this mess (which she is supposed to ignore) I feel like she is shutting me out of her wedding plans. She is cold and doesn't behave with me like she used to.

I believe in letting people live their own lives and make their own choices but she is my best friend and I am totally lost.

The wedding is in two days... please tell me what you think.