What would you do.

I'm aware this question is ridiculous to some but to me it's a problem.
My husbands leaving me and our daughter and I always wanted a 2nd child.
I don't want to have kids to two different men and after my husband I refuse to give my body to another man. 
But I want another baby! 
If my husband wants casual sex, should I just go for it and if I get pregnant I'll take care of the baby myself or just move on and accept the fact I'll never have more kids 

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