Help me please!

Ray

I found out my husband is having an online relationship with another woman. I am heartbroken. He showed me deleting the app that they were chatting on & told me he wouldn’t do it again. I asked him why he did it and he said he liked the attention and it boosts his confidence. I am so torn on what to do. Do I tell my family and try to get help from them or do I keep this to myself? It’s eating me up inside every day not letting them know what’s been going on but then again I feel like I should keep this to myself. Ugh. Please help! I’ll take any advice.