How is it possable to fall in love through a dream?

I AM TALKING OPEN AND I NEED ADVICE, I DO NOT NEED TO BE CRITICIZED BY MY ACTIONS. How do I begin, I just got back from a deployment to Iraq, and while you are there you get close to people, you know there weaknesses and the good point, there ups and downs, what makes them tick and laugh with one look. You become so close to people in that situation that you will know forever you learn to love and truly care about people when you think not. Well here it goes.. I am the other woman, its a new thing. It hasnt been a long time thing for me.. Hes a great guy but I knew things were wrong with him, when everyone would see him put a smile on. He was a very close friend of mine. We are now back in the states, and I get a text and its him. We started to text and then he asked to see me I was like cool, hes an awesome guy. Things happend with out thinking about them. Him and I have now made a HUGE physical attraction and sexual also. Well I keep having this reoccuring dream and now I find my self falling for him knowing hes married. His wife and him since.. last year have fought and hes an amazing Father so I thinks thats why he stays with her. I guess I need to know if its possable to fall more in love with someone through a dream. I need someone with an open mind and can answer this..