am I to blame?

Advice please... I was with my ex bf for 5years lived together for 2...our relationship was amazing went away always did stuff..hardly argued its been great until unfortunately 6months ago I left my job to work somewhere else it was completely miss sold to me I was gutted. Unfortunately been out of 2other jobs since aswel coz of crap companies. I had to sign on JSA but to pay my bills. He earnt twice my salary but I still managed to pay my way. He took over council tax for 6months but I always said I'd pay him bk when in a job. We lost 2family members aswel and I was also diagnosed with sciatica. I lost alot of confidence but I was not moping around I was constantly applying for jobs and going to interviews I want to work!. Our sex life was not great becoz my head was all over the place with job.feeling low..sciatica.he wanted it All the time I didn't. I never took advantage of him or anything we were ment to be saving for a mortgage but I was no where near where he was bCoz he earnt so much.he told me he wanted space after a mini argument which I gave him he then finished me a week before Xmas last year he is a golden boy and his parents have always interfered in our relationship. He means the world to me but broke my heart. He's already messaging other girls even in Xmas day! He told me were not together there's nothing to respect! Am I to blame? Did I push him away? He said I wasn't committed enough? I did everything for him! Just had a rough 6months. Now he's off with me.