Statistically speaking, there'll be cheating in any given marriage more likely than not.

So any given person has two choices: accept the bullshit romanticism notion of a 'the one' and an improbably bump-free marriage, or get real and work relationship issues as they come. Millions of couples have worked through infidelity and come out stronger for it.

And in all situations no matter how bad, the question to ask oneself is, what could I have done better or differently? OP doesn't control their husband, but they control themselves. There's a huge difference between this and victim blaming, unless one wants to live their life as a victim I guess.