Why do some men say they are going to call and don't?

I don’t think I’ve experienced that I think they usually just ask right then versus letting me know ahead of time that they’re going to call if that makes sense ? but I’d be okay with them not calling since I hate talking on the phone lol. I feel like a lot of people in general like to talk on the phone and it’s just awkward and I have nothing to say.

If I were in that situation I’d think that they’re just saying it in the moment maybe, a lot of men tend to say things in the moment and then realize that’s not what they wanna do or they’re not as interested maybe.