We have know each other for a few years and I had decided to ask him out and he said I don't know, what does this mean?

[Mango-happy_person]

[Red-Blaze]

Maybe you suprised him
or maybe his not seeing you that way

give them some time and if they dont come back ask calmly if they where thinking about it

I world not feel its good to jump to ideas
At least not from such small context it can mean one million things :)

[TommyMountainFigure]

It means he isn't interested in you, but he's to scared to say 'no' outright.

[Wise4myage]

That means he's not into you romantically or he would have said yes.

[Iron_Man]

That doesn’t sound very good it’s like he could take it or leave it

[JohnK123]

He doesn’t want a relationship like that sense I don't know