My boyfriend says he doesnt love me when he is drunk?

We have 3 children been together for four years and live together when he is with certain people he goes out with them until all hours in the morning including the lastest of 6am. he gets very drunk and very nasty says a lot of hurtful things, for example i dont love you anymore.... in the morning he is always very apologetic..... however the bank holidays that have just gone he went out 2 days in each each weekend, and on one of the days made me come home so that he could go out again.... i have had enough when he is sober he is the nicest person when drunk he has a personality transplant and becomes very selfish....