Help me please

My boyfriend came over yesterday and we had really good sex like usual but we are not sure if the condom broke alyways this time he told me something.... he said he was loosing interest last night he was with the girl that a friend tryed to hook him up with and it wasn't me it was him. We kept talking and agreed to give us one more week and if we choose to stay together we will.... what do I do to save my relationship ???