I hate my husband or wife. Why?

Only you know why you hate/dislike your Husband/Wife. You can start by answering this question my making a list of the things that you don't like about your significant other.

I understand that it could be difficult, but maybe sometimes we just don't forgot to show appreciation?

That's hard to answer from this end as no one really knows your relationship. Consider things that may have happened to cause these feelings and try talking them out with your spouse as many times communication, or lack of, can be an issues.

Maybe because he/shes do something bad and you don't like it, or your feeling change about your husband/wife and you can't be with them anymore

Only you can answer that question. Reflect on what brought you two together in the first place and then what has changed. That may help set you in the right direction to finding your answer.

because when i love him he doesn't love me back the way i want him to! he says he loves me his own way, i don't understand that...

Because she can never understand me or my emotions. I can understand her emotionsn or feelings but she never does mine

Satisfaction and connectivity are important things in a relation between couples. It's not just physical. You need to be satisfied mentally with your partner. Satisfied why the way he acts at the time of crisis, satisfied by the way he handles responsibility. Satisfied by the way their partner respects their in laws. Satisfied by the way he think life is about. Connectivity will resolve their inner issues. If someone have to wait, they need to be connected to understand the reason so that the issue doesn't get bigger. If these things are missing then a husband or wife can hate their partner and that's valid too.

There could be a number of reasons why and to be honest, you are the only person that can know why, you need to stay true to yourself, spend some time away or get some headspace to yourself, and try to figure out what is going on, you could try writing it down, and after that you can figure out if you can work through whatever issues you're having with your significant other, talk to them about it too, stay true to yourself and be honest!

Well it could be bad habit they have that stikes a nerve, it could be something they did to upset you, talk it over with them, its the best option right now.