Please help me.. I dont know what to do?

If i was you id ring up the idiot and give him a bad time ! im a girl :P and your gf is very lucky u sound very nice and wonderfull xD .. maby you should tell your mum your gf is wrong to think the texts will stop over time maby thay will but ushaly what happens is she might get forced into meeting up with him and getting hert if she falls for the texts ..... tell some one good luck boy x