What could zero reaction mean?

There is a guy I was into for a couple of years, and things happened between us a couple of times over the years. However, it was always a complicated situation.. he was always flirty and said he fancied me etc. but alwyas maintained he didn't have feelings and wasn't looking for a relationship.

However, he would always say that he'd had zero feelings for any girls in years, couldn't get over his ex, didn't want to be with anyone etc.

He's even told me "I should meet someone else" etc. and I wish I had sooner. At the same time, he will flirt with me online and stuff..

The annoying thing is that he's always acted jealous about other guys, even though he's told me I "should move on" etc. and that he doesn't want to be with me.

I have met someone recently who I like a lot, and it's mutual, and I am just really happy at the moment. I am still on friendly terms with the other guy.. the other day, he actually flirted with me online.

He hadn't any idea about this other guy, but I thought it was best to be clear and that we would just be "simple friends" now.

So I told him, and he read the message, and replied absolutely nothing to it. After a while, I sent one saying sorry I hope it's not weird i'm telling you that, and he went "oh don't worry I was just at work" but has still made absolutely zero reference to what I told him.

Maybe he doesn't really care, but it's really not like him to ignore a message (he's still ignoring me now), I just thought if it was me, I'd at least say " oh cool" "that's nice" or something along the lines.

If he "really wants me to move on" I thought he'd be happy for me? I just find that bizarre that he has completely ignored it and is now not talking to me much, which is out of character for him.

Any ideas as to why? Thanks