Can you get pregnant by swallowing cum?

I have been involved in an impossible situation for 5 years with a man who lives with his girlfriend of seven years. We have the most unbelievable sex, it is so intense yet he stays with her. I am a divorced single mother of 2 children. I feel I am in love with him & when we are together I feel he intensely attracted to me, yet we never discuss the situation. I am afraid to tell him my true feelings for fear the affair will end and I really need the time we are together. I know that this relationship is unhealthy, but I don't know what to do? Do you have any suggestions? Thanks in advance for the advice!!

I know my question will either make you laugh or disgust you. My boyfriend of three years (we are both in our early 40's) passes gas and belches around me, of course he always says "excuse me", but I still find this a big turn-off. He says I should take this as a compliment that he loves me very much and feels comfortable enough around me to do this.