cold -distant attitude what to do?

We are together many years and we have reached a point we need to move on in another level ( stay together or getting married) since those cpnversations
Are on the table and he knows that is silly to have another break up that after a while will be together again ( he have done it the last 3 years several
Times and the longest period apart was lime a month) he now does these colds ki da breaks like talking to me without saying anything of what is happening he just says im
Not ok and doesn't want to meet.and all this all of a sudden... we were very closed larely...and then that.....
I feel like he wants to do his things ( flirt) without facing any unpleasant conversation 
I had made my mind to see how is going to be untill sept and decide what to do, beacuse clearly i want this man but if he continues like that taking no reaponsibility and decision its pointless ... what should i do?