Why would a man give me his number without me asking for it?

[itsquirky]

I followed a man on Instagram 3 months ago. He didn't follow me back. But he accepted my message request and since then I started messaging him. I am always the one who texts first and he replies. Sometimes he replies and sometimes he leaves me on read. He is 14 years older than me. Last week I asked him just a random question and asked him his opinion. No reply from him ( I don't even remember if he had seen my text). But once he had missed my text. So I just sent him this😅 emoji. The next day (almost after 12 hours), he, instead of answering the question, just messaged this: "Hello. His no. This my number... u can call me at night"
He still doesn't follow me back but since my profile is public, he has viewed my IG story only two times...1 - When we first talked and 2 - on the day when he gave me his number.
I am curious to know why he gave his number suddenly out of nowhere and that without me asking for it. And I'm a little bit confused also. What do you think from all this?

Updates:

[btbc92]

He wants a hookup. Most men at those ages seek a sexual relationship with women your age because they want what they want. That's why. You do not have to accept his number.

[zamasux]

He gave you his number because many men don't want to be a creep to ask girl's number. If she is good with this she will call me, that's fine.
But what give a not good vibe, he said you can call me at night. Why just night?
🤔

[In_Trance]

Maybe he wants to talk to you but doesn't like the crap you post

[SphynxUK]

He’s not interested in you.
He would have instigated some text or chat by now. And to think you’ll call him at night? What’s wrong with the day?

[Avicenna]

If he's interested or assume you are, he will

[lanadelrey25]

Hmmmm... I wonder why? These confusing boys... smh