@G2g,
You might not have a choice in this. IF your husband feels that he cannot live with a cheater, he'll file for divorce regardless.
You are 24 years old, have already 3 children and jeopardize your marriage because you cannot stay faithful. Sex starts in your mind and if you cannot control your mind, you're in dire straits.
Moving to another country and hoping this problem will go away on its own is quite naive. You need to change your mindset and the pattern of behavior - and only then will the cycle break.
If you don't change fast, you'll find yourself alone with 3 kids to raise and then you'll be financially and physically too exhausted to even think about sex.