They're hard because they require work. No one gets married and lives happily ever after. If you're not willing to put in the effort to communication and respect each others feelings, it will be a difficult partnership. And "till death do you part" is a long way away.
Sometimes I think it becomes more of a business arrangement as the years go on. Love takes second place to profit. Not all, but some. Maybe that keeps some marriage together, so it could be a positive also.
I wouldn't call it hard .. because it's not ALL hard.
I've been married to the same man for .. almost 37 years .. and I have experienced everything .. some bad, but mostly good. I never entered into this marriage lightly .. and even at my young age of 18, I wasn't so naive to think that there wouldn't be some shaky ground.
It's a roller coaster ride. Filled with laughter, tears, disappointment and elation .. We built our life together .. and I want to emphasis .. 'together'. We entered into a mortgage, we raised kids, we built a business from scratch, we argued, we made up, we laughed, we cried, we experienced growing up and growing together, and now we are just growing old .. all at the same time. Now having said that, however, I'd like to point out, we never lost our individuality. WE are here because we choose to be here. WE stayed because we chose to stay.
Life is what you make it .. and marriage is no different.
The adjustments each has to make in order to achieve a fair balance in the newly formed partnership are at times difficult for one, or both. Honesty,fidelity, and communication are essential elements and even these are challenged by hormonal changes. If the storms are weathered together, and the difficulties forgotten, marriages can become golden and last for 50 years and beyond, as Ours did.