When a guy doesn't reply, does it almost certainly mean he is not interested?

he might be busy?

It's been a week..

Just call him. If it rings out or he declined your call the he's avoiding you.

OMG you are literally in exactly the same situation I was in last week. Definitely do not call him as I'm assuming you don't know him super super well- also might come across as clingy. The question I think you're probably wondering is if he is not replying because he's playing games (so he doesn't look too keen), if he just can't be bothered (there are times I'm sure when we all just can't be bothered to reply to anyone), if he's not replying because he's not interested, or he's just being a typical stupid boy. I would say that you should leave it for a day (and I know how hard that is honestly) and then maybe message him on an alternative thing, i.e. on text. Also keep in mind that he could be wondering what to say or just not know what to reply- as to be a honest just writing a quick message in reply is not going to take much time so being busy isn't a reason. You also need to bear in mind that most boys are also not as heaving invested in the keeping in contact via messaging bit while girls see it as a big thing, boys just don't have that urge to keep in contact (even if they like you). If you need any more advice feel free to message me as I was in a similar situation. Good luck! xxx

It's not for certain, maybe he's seeing how you'd react. Don't double message him, and if it goes on for longer just leave it and you'll forget about him.

Oh.. My advice would be just leave it, or you could pop up to him?
He may have forgotten to reply; you never know.
If you do pop up to him, I think you should decide if he's worth it or not. If he's giving you short replies, you should give him short replies.

don't over think it. If he cares, he will come back.. if not, call it a day and grab some fries and watch scary movies.

Alright, so what movie do you recommend?

:/ okay, thanks. I was the one who started it too when he didn't drop a message after adding him. He is hugely into video games though but he is online hours at a time so he's probably not interested. Ugh, life is so unfair

Are you talking about tsr or whatsapp im confused??

Or he's a geek and doesn't had very good social skills.

Disturbia is one of the few horror movies I've seen as I don't like them but I thought that was good.

Or go and watch Spectre with some friends

woman in black is pretty good, insidious 1 is also up there. I loved amity ville horror