Wife no longer in love with me

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It had a lot to do with it. I was often unhappy and taking things out on her. I also took her for granted and she felt I didnt respect her enough, which is crap. I have the utmost respect for her, I just got complacent and focused too much on work and didn't think it was doing any damage to our marriage - well not enough damage to do what she's done.
She fell out of love with me as she felt she couldn't make me happy and that I was unhappy with her, which isn't true. She says she got "scared" that the future would be tough with us. And also if we were to have children, which was supposed to be this year, then if things went bad again in the future then she would be "trapped" in Australia in either an unhappy marriage or as a single mum.
None of it makes sense to me. I can see what I did wrong and the way I was behaving, but I feel a marriage should be forgiving and you work on it together, not run away.