How do i know i my wife love me?

dont understand her all the time she dont get some thing she nags and will always be dont want u to be like this and that compering me to other people. does not like my family because they are not religious, will not let my children play with my nephews. she dont like for me to drink well i do drink one every new years but thats all. now since she started to go to school she met this girl that has gone tru a divorce and talk to my wife about everyting. now my wife tells me lets drink please dont know whats wrong. i fixing to leave her but i love my children a lot that i will support every ting she does to me even if she cheated i will be with her to love my children