I'm glad your family are so supportive and caring :) Keep focusing on that.
I think your colleagues are being quite unfair. I don't think cancer is a reason to stay in a relationship that isn't working. I understand it will be tough on her at this time, but it is not right to fake feelings that aren't there anymore. If you feel it was the right thing to do, then we are behind you completely. Anyone who isn't willing to consider your reasons for ending it is not worth listening to.
I think you need to distance yourself from your ex. Unfriend her on facebook, delete her phone number. This toxic situation is hurting you, your mood is suffering; you need a break. Maybe she does, too.
*hugs*
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