I Married Someone I Don't Trust. What's The Way Out?

I have a girlfriend I have dated for 5 years. I'm the very sexually active type but I don't make love to her often because I want to keep her in good shape till when we will get married. So I do visit brothel to satisfy my sexual desire which she is unaware of because of the little distance between us.
I decided to stop patronizing prostitutes and have an extra tyre (gf). So I got one living in my street.
The new girlfriend does not disturb my relationship with my long time girlfriend. She loves sex more than food and am happy I met my type. I started having issues with my main girlfriend and broke up with her to stay with someone that lives in my street and ready to give me sex daily.
She always want it raw saying she is under medication. But she got pregnant 6 months into our relationship. My family forced me to accept the pregnancy and marry her because am the only child of my parent.
She gave birth to a bouncing baby boy last 2 months and I have never made attempt to make love to her. Though she is doing well in her business and doesn't disturb me financially but she keeps deleting her calls and chats which am not comfortable with. Though she has got good character but am afraid she will cheat on me because of her love for sex.
Nairalanders pls help me out so I won't regret this decision I was forced to take