You assume a lot. Yes, husbands are to love their wives. But where in scripture does it say that if they don't, the woman is free to divorce him? Seems like that would be returning evil for evil. In fact, 1 Peter 3:1 tells us that if we have an unbelieving husband, he can be won over without words, by the behavior of his wife.
You're right, I'm not in a loveless marriage. I can't imagine how hard it would be (which is what I meant by not giving up just because the marriage is hard). My heart hurts for OP. Yet, we have an example in God with how we're to respond: Forgive and forgive and forgive, right? Love is patient and doesn't give up, yes? God is our best example...he loves us even when we are "emotionally detached" or "cold". And with that love, he slowly wins us over. OP still has the chance to do the same with her husband.
Love is a choice, not just a feeling.
Long story short, as other posters have said, God HATES divorce and being unhappy in ones marriage isn't a legitimate reason to end a marriage.