My ex cheated.
Her reason:
1) I didnt love her.
Yet she was the one that stopped using the word love, she didnt ever want to cuddle i had to cuddle her etc. She was avoidant, distant all the time. When i said on the phone i love you i usually got only "bye" and never a response.
I for the other hand tried to find logic in her constant arguments over nothing (she needed to argue).
Payed off her debts so that intrest would not eat her up (she started to get into debt again 3 month later but didnt tell me).
Then when she asked if I`m _sure_ that she`s the one and we will live happy ever after my response was "I will be sure when we will be buried beside each other, we dont know what life has in store for us, but i love you and want to try to build my life with you".
(How could i be sure if we constantly argued for 6+ years over nothing because she needed to, and was acting avoidant/distant?)
I`m a realistic person and i always was and she knows me, we`ve been together for almost 8 years for fraks sake.
Her fear of abandonment must have been put into overdrive and she ignored everything i was doing for her (paying off her debt, building a new kitchen, suggesting that i could care for her when she wanted to change jobs but didnt have the money etc.)
She knew i would do anything for her.
So... . ~~
She cheated with a guy who has shizophremia and is bipolar. And often was locked up in a psych ward. And lives a few houndred km away, and is 3 years younger then her.
When she drove to meet him after our brakeup. He got an attack (wonder what caused that huh?) and was taken by an ambulance and locked up for a week... .

... . her abandonment fears must have exploded then i think.
She didnt have me and didnt have that guy... .