Is it fair for my boyfriend to expect me to pay half the rent for months I will not be living w him?

hi guys! he wants to get a place in march and I can't go live w him until school is done in may, he knows this, he expects me to pay half the rent in march and April and said it is the right thing since it is both of our place... what do you guys think? is he an asshole or is he right? also pls see my previous question if you have time, I would appreciate it :)
Is it fair for my boyfriend to expect me to pay half the rent for months I will not be living w him?
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