Break up?

Can anyone explain to me why I had a dream that my boyfriend broke up with me there is nothing wrong with out realtionship we have been together for two years and though all that time only one time have ever had a fall out I "cheated" on him once I sent a picture to someone else and yea :/ I regret and we've moved past it he has forgiven me and he said he can trust me now that I have soon myself to him this happened awhile ago and I have only had one other dream like this a long time ago so what does it me? I'm afraid of losing him now I told him about an she said that won't happen that he loved me and it was okay I didn't need to worry but I am worried :( I don't wanna lose him please help