PLEASE HELP ME FIND THIS BOOK

PLEASE HELP ME FIND A BOOK I FORGOT

I am trying to find this book I read in 2011, it’s a dual POV I believe but basically this woman meets this guy they fall in love and he’s got this nice apartment in the city that they be at and yada yada but he be disappearing and leaving her abruptly, so one time she follows him and he goes to a house in a nice neighb and turns out he has a whole ass wife and family BUT the thing is, i don’t really remember fully but he blacks out or he lives two different worlds or split personality IDK I DONT REMEMBER, but there’s something like medically wrong with him like if I remember correctly he doesn’t know what’s going on he doesn’t know he be blacking out, when he’s with his wife he doesn’t know he lives a different life same with the main female lead, when he’s with her he doesn’t know he’s married or idk man cuz he was in an accident or something fml I don’t remember !!!!!!! BUT I believe the wife knows about it and she just lets him be because yea she loves him and I don’t fkn know man I don’t remember UGHHHHHHHHHHH but if anyone knows or has an idea pleaseeeeeeeeeee tell me CUZ I DONT FKN REMEMBER

by Large_Suspect_950