Hello i need some advice i just got through a really nada heartbreak my ex left me for another girl and i was ?

Devastated.I was still messing with him because i was still im my feeling with him and plus he kept stringing me along.Well his lil girlfriend knows that he still tries to contact me but i told her i stopped all contact and sexual activity because i have morals and it wasn't right.so i guess she told him and put him out so now he is upset with me because she know he still tries to call me and i haven't been giving him time of day for 3 weeks so now he text me saying im something else and i messed up what they had they been together for four months and we been together for four years but today i just got fed up and changed my number was that a smart move and is he going to leave me alone now i mean you left me for another girl so you should be happy instead of calling me?