New relationship

I have made a mistake here.
This was too much too early. I spent the last two weekends there, taking a couple buses. First night, he tells me he loves me. My ex did at 6 weeks in, but we’d been together almost every day so.
We had sex.
I had told my ex I wasn’t going to anymore unless I was married, and here I am doing it?
I won’t marry a non christian, and he definitely isn’t.
He even has (in my opinion only) demonic statuettes around.
He told me Our hearts are one.
He’d been alone for 20 years, which made me wonder why.
Hes social, knows people, goes to music events. He said women tell him they just want to be friends.
The sex was not good. There was no compatibility, rhythm was off.
I said we fucked. He said, no, it was making love.
I felt like I was with a woman.
Last weekend when we parted, he said he loved me, I didn’t say it back, as I was starting to realize this may not work.
Later he asked what was wrong, cause I didn’t say it back!
Admittedly, I was distracted about my finances that morning anyway.
I think he was/is needy, maybe desperate.
We mesh well as friends, hes nice and caring.
I dread telling him, as he will take it hard.