when do you finally let go? when is enough, enough

My now ex and i wer together for 7.5 yrs this month. We've been on the rougher side of our relationship now for bot 1.5 yrs now nad there has been a couple times were i shud hav booted him to the curb but made different decisions and now he has ended the relationship (for now) because he doesnt know what he wants anymore. He needs space. Do i give him this space on hopes of him coming home sometime soon or do i give up completely and move on?