meaning of dreams husband wife

I dreamt that my husbands ex wife was living with us and he suddenly told me that he had slept with her 2 days ago and that he was no longer in love with me but was in love with her. I asked him if it was because i was fat and he said yes.
I didn't want to leave him but he was insistant that i leave and started to pack a bag for me. I woke up quite angry and upset.
My husband and I are both on our early 40's and it is 2nd time round for both of us. I have had issues in the past with jealousy but thought that i was over it! Please help, this is driving me mad!!
Thank you. Alison Gladstone