What should I do

My fiancé and I have been together for 2 years and we have been thru a lot how do I make him understand that I love him for some reason when he goes out and gets drunk with his co workers he always Reyes to start an argument and always ends with him telling me that other women would be happy to be with him and a bunch of other stuff and I don't want to say it because I know if I tell him half as many of the people that hit on me just on my walk to the store(not to sound conceited ) he would think I'm cheating can someone help me please I really love him and I really want to marry him but sometimes I feel like it's not going to happen