How to get rid of me reocurring dream?

Me and my partner have been together 3yrs we have a 9mth old daughter together and before she was born I started getting dreams my bf was txting other girls and hiding it from me and giving his num out on fb which I later had found out he had and all my dreams were right and I felt exactly like I did in the dream ect, well we managed to work through it and been back together 5mths however the dreams are back and I dream that he slept with sum1 while we were on our break and is txting girls again although he doesn't have a fb anymore or internet, he's changed his num and doesn't have any gals nums and doesn't go anywhere without me, we live together but whyare they coming back and how can I stop them? There ruining my life