I had the most unsettling dream about my love

I had a dream my boyfriend left me for another man. I don't remember the whole dream, but I do remember coming in to the bedroom to find him laying in bed with some girl and me telling him "come on baby, let's go out to eat." He looks over to me from his phone and says "no I'm going with Jacob." I stepped back confused, "what is that supposed to mean?" And he says "I want to be with Jacob." And the girl next to him adds, "yeah they're too cute together." I scream "what the fuck? He's my fiancé, what are you telling me." He gets up from the bed and tries to hug me, saying "I'm sorry" I push him and run out crying, seeing the guy walking in as I was about to run out of the house. I slap him so hard he falls. And I just ran and cried and ran and cried, through woods until I ended up at a cliff and seen that my fiancé texted me (don't remember what he said) but I threw my phone off the cliff and collapsed. Before waking up feeling as if I was falling.