HELP! He cheated...

After 4 years together a reversal, my daughter and now pregnant with twins a family feud broke out between him and his brother. His brothers lovely wife decided to text me and tell me while he stayed at there place for work 2 years ago he was seen getting picked up by his ex and than caught another night with his brothers wife’s friend getting his dick sucked on their balcony. He apparently lied to me lots saying he was sleeping but actually out partying and hooking up on dating apps. Apparently she has video proof of him picking chicks up and is going to send me the videos. I’m so lost, hurt, confused and disgusted and don’t know what to do 😭🤯