Sounds like he just doesn't care about you anymore and decided to just leave it at that.
Like you said you're both on and off, if this is something regular between you two and you're fine with that, he'll be back soon enough.
If this is not like him then I'm afraid it's over. Besides there's been no contact from him in TEN days, that's a lot. If he cared enough about you, he'd have at least text/emailed you by now.
Don't worry girl and don't be afraid to be single above all don't settle, you deserve to be loved the way you want to be, so put him behind you and move forward being fabulous.