Please advice her responsibly

Mummy My husband woke up one morning and decided to marry a second wife, we didn't had any issues nor quarry even as l'm telling you preparation is going on, I have cried, I have begged my husband to at least tell me what I did and where I went wrong, heaven bears me witness that I have been a good wife to him, I have loved, care, respected, cherish and pampers him like I trust this man with my life but his just saying his decision is final and his not going back, this is someone we have been building from scratch and now God has blessed him this is how his paying me back. Please I need advice from your followers I'm depre$$ed and I may just end it all but I don't know what will become the faith of my children when I'm gone. Thank you and notify me