How can I get my wife to want to have sex with me again?

Anonymous
So I'm having a pretty serious issue. I've been with my wife for 7 years now and we have children together. Our children are ages 3 and 1. She also stays at home. So Our sex life is struggling horribly. She never wants to have sex. I can't really handle 3 or 4 days without having sex like she wants to. I do take care of myself here and then but I hate having to do so because I have her around.
We get into a lot of fights because of this. I guess she could be tired but I'm always working and I make sure that they're taken care of.
When we argue, she asks me why she would want to have sex with someone who's so mean. I do understand that I can be mean and say mean things but being sexually frustrated doesn't help that.
I know that the things I tell her doesn't help. When we first got into a relationship I cheated. And she found out and forgave me. I feel like our sex life has gone down since then.
She said she doesn't ever feel like she is good enough for me and that I want other people because she thinks that's what I've always wanted.
Not to mention when I'm infuriated I've told her that I'm going to get a girlfriend, or that I'll have to take care of my sexual needs elsewhere. The last time I said that I was going to bring a girl home and she was going to be my girlfriend, and my wife had no choice but to love her because she was going to help me with everything that my wife doesn't help me with. I don't ever mean anything that I say it's just that I'm really frustrated and its like she doesn't care about me, just her feelings. I feel that I can never get her to believe me now. She says that I've hurt her but she doesn't know that she's hurting me by depriving me. I've basically dug my hole so deep that I don't know what to do now. She's really the only one that I want and I don't want to ruin our family but she doesn't ever want to have sex with me and I don't know how to help.
I know it's my fault for being horrible. I don't know what to do. Can someone help me?
How can I get my wife to want to have sex with me again?
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