Evans is now dating actress Jessica Lowndes, while and Brook rekindled her romance with footballer Danny Cipriani.
"Thom wanted to be as far away from Kelly as possible after the split. She totally humiliated him. He never expected to fall in love so quickly, but now he's setting a life up there and Kelly is history," thesun.co.uk quoted a source as saying.
"Kelly started to make Thom's life difficult by sending him messages saying she wanted to talk soon after he announced his relationship with Jessica, which was upsetting for them both," the source added.
Evans has made it clear to Brook that he has moved on and that he does not wish to have any kind of contact with her.
"So Thom has cut off contact once and for all and changed his US mobile number as well as his email address. He doesn't want any communication and told her in no uncertain terms that he had moved on. Her behaviour towards him over recent months highlighted his decision even more," the source said.