HEA or HFN endings?

I had to look this up, I was browsing through some websites for romance publishers and it said that all stories must have an HEA or HFN ending. I discovered that HEA meant “happily ever after” and I’m assuming that HFN means “Happy for now” I could be wrong about that.

I understand stories need to end, and HEA and HFN do seem like tidy ways to wrap things up, I’m not saying that none of my stories will end this way. But when I think about the 50 shades of grey stories, the thing I absolutely hated the most was the ending. It was such a nice fantasy, the idea of meeting a gazillionaire and being swept into your first exposure to BDSM. Then suddenly they were a happy family playing in the yard and all of the fun ended. Where’s the fantasy in that? I thought the way it ended was a bummer.

Plenty of good and decent people live their kink and enjoy BDSM in addition to a fulfilling and otherwise “normal” life and leaving it all behind felt like a loss. I hate the idea that she “cured” him of his kink as if it was a disease. I hope to avoid this disappointment with my stories, but I have to keep reminding myself that you can’t please everyone all of the time.