I can completely understand why youre angry and at the same time i don't understand why he would lie about it if he didnt know who it was from.
Although he mightve just thought it was his mate pissing about.
If i were you, i'd try not to make it a big issue, but i would say to him, i know you lied to me when you said it was your mate texting cuz it was me off my new phone.
But also have you given him ur new number now, cuz those messages would come up form you know.
...with these A Level results?