There are givers and takers in relationships. I wold be afraid that this pattern would continue. There are chemicals released in our bodies when things are great. These chemicals are very addictive. You have to look at him as a whole, good and bad. Do you want to sign up for a life of this type of behavior ? I would suggest reading Necessary Endings by Henry Cloud. It is an amazing book on deciphering various types of relationships. You also may want to google narcissism. Bless you! Been there...