Divorce...

Today is mine and my husband's 12 year anniversary. We have two children and a home together. He's cheated on me multiple times with multiple different woman, one who's been clinging on for 9 years. I know it's stupid to stay, but I love him. If it wasn't for me snooping on him I'd never even know he's cheating, he's very loving, attentive and caring for our children. I don't feel like we're in the same level sexually either...I like more plain run of the mill sex and he wants the kinky let me tie you up and gag you sex. He has even been talking to men online recently. Financially I couldn't survive without his help as he makes four times the amount of money I do. I'm terrified to leave but feel like it would be better to do now while the kids are still too young to really realize what's happened. Ugh I feel stuck.