Is It Advisable To Begin A Relationship For Enjoyment?

I have been seeing a man for three years. He is divorced. He told me from the beginning he didn t want a relationship . We get along really good and have a lot of fun together. He is in financial difficulties at this time. He talks about how he has been hurt in the the past and he has to protect his heart. Now let just have fun and enjoy each other. I am divorced for 18 years and him 3yrs. He talks about his past relationships sexual and casual all the time. He tells me when he flirts when he is out. It bothers me. What do you make of this?