My reaction would be to immediately make him sit down, if necessary nail his feet to the floor, and discuss openly then and there, exactly what he meant, why he did it and what this meant for your relationship, including discussing whether it should be brought to an end. Whatever the problem, it has obviously been festering for a long time, for him to come up with a plan as contrived as this.
The three month break is a good idea, but only if BOTH of you have a planned and structured agenda about your relationship to think about during this absence so that the discussions when you return have a clear purpose and he cannot hedge and shuffle to try to avoid reaching a clearly understood path for your future relationship or its end.