<human>: My ex-gf and I dated for a bit over 3 years and lived together, great relationship and pretty healthy overall. Marriage talk was had. For the first time in our relationship I faced a crisis. 

The following happened within 2 months before I broke things off:
- diagnosed with melanoma, became mildly depressed for the first time in my life; found a doctor myself and while she was emotionally supportive for a few weeks: I think it just hurt her to see her 'strong, fit bf' as 'weak'.
- lost my job last year for 2 months: caused her resentment and said she lost respect for me for losing my job 
- sexually rejected, which never happened in my relationship. My depression meant I didn't connect with her emotionally, so she rejected me physically. 

I was confused about the job loss because I had always saved money for a rainy day, so we didn't have money problems.  It's been a year: I'm doing well at my new job, seeing a new girl the last few months who is awesome, still fit and travelled with her a bit. 

NOW my ex-gf wants me back seeing how happy I am. I'm just very confused and my mind is screaming not to get back with her but my heart wants to. I feel these patterns return in the future should I go through difficult times. When she texted me, I just deleted it without reading the long text. 

Why would someone want to marry me, then abandon me when I need them the most? I absolutely adore my new gf because she seems much more supportive, so no chance of me leaving for the ex. AM I CRAZY for wondering why a partner would abandon me though? Or am I doomed to face struggle alone?

Can you summarize the given text in a few sentences?
<bot>: I broke up with ex-gf of 3 years after she became unsupportive when I got skin cancer/lost my job/became depressed. A year later my life's great and she wants me back