Why would married guy say this, is he a cheating liar?

I was talking to a friend, a guy I met at college a few years ago.
I had a bit of a thing for him but the timing was always off and we’re just friends.
We were having a friendly catch up recently and I know he was married and I’m happily with my partner, then out of the blue my friend says he’s not living with his wife and I can always stay with him if I’m visiting…?
He says they spend lots of time apart and I asked him point blank are you separating and he said no…like wtf?
I was shocked, and we haven’t talked since, I hate lying cheaters and I can’t believe he would do that to his wife either!
WHY would he say this to me?

Why would married guy say this, is he a cheating liar?
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