J. Lo says Marc is "not good" for me!

Jennifer Lopez is opening up about her split from hubby Marc Anthony.

In an interview with Vanity Fair, she says, "Sometimes we don't realize that we are compromising ourselves. To understand that a person is not good for you, or that that person is not treating you in the right way, or that he is not doing the right thing for himself -- if I stay, then I am not doing the right thing for me." J. Lo adds, "I love myself enough to walk away from that now."

She says things went south when she returned to the spotlight. "We had the first three years of our marriage just for us. I wasn't working, it was mainly about him. Then we got pregnant. Then it became about the kids. And then I started working again." Jennifer said she and Marc fought about everything. "Marriage is tough. It's not going to be perfect....It's definitely challenging." This was Jennifer's third marriage.