Looking on the internet deeply has found these results:

hard to me is the most popular phrase on the web.

hard for me 145,900,000 results on the web	hard to me 1241,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
I was committed, which is hard for me. It's been hard for me to fit in at West Bev. You're training yourself so hard for me. It's very hard for me to explain my process. It's hard for me to leave, now. It was just hard for me to watch him. Jack, this is hard for me. Seriously, this is hard for me.	That had to be hard to say to me and I appreciate it, but I don't care. Even though everyone's trying so hard to comfort me... These sordid kind of things are coming hard to me It's taken me some time to work out what to do He's trying so hard to please me. Now if I help you it matters that you see These sordid kind of things are coming hard to me Trace, you don't have to work so hard to impress me. You alWays tried so hard to suit me... You're trying way too hard to make me feel better.

hard for me

145,900,000 results on the web

hard to me

1241,000,000 results on the web

More popular!

That had to be hard to say to me and I appreciate it, but I don't care.
Even though everyone's trying so hard to comfort me...
These sordid kind of things are coming hard to me It's taken me some time to work out what to do
He's trying so hard to please me.
Now if I help you it matters that you see These sordid kind of things are coming hard to me
Trace, you don't have to work so hard to impress me.
You alWays tried so hard to suit me...
You're trying way too hard to make me feel better.