Hi, Sorry but I do not agree with the other two comments. A wife and three children are worth fighting for, especially since you do love her.
It takes time but once before she fell in love with you, and you need to get her to fall in love with you all over again. Snooping will not help, so give her her privacy and space that she needs. Treat her like someone that you have just met and are interested in going into a relationship with. In other words, pretend that you have just met her nad have not been married to her.
If you manage to pull it off ( I did in a similar situation) you will never regret it.
Good Luck.