Relationship He’s pushing me away

He pushes me away constantly lately. He deploys shortly for his 6th deployment soon. I’m trying to stay strong but the pushing away is wearing me down. We will be good one week and the next week he’s nit picking all my faults, doing distructive behavior, and just not sure where I stand with him. He tried breaking up with me this morning and I told him to take space. What do I do when he tries to push me away?