Need some input mamas!

The only time we ever co slept was the first 2 nights we got home from the hospital. He refused to sleep anywhere else. Well we finally got him in his bassinet after that but now he's almost 3 months old & the last 2 nights he once again has refused to sleep anywhere but with me & SO. I don't understand why all of a sudden? Should I maybe try putting him in his crib? Idk if I would be able to sleep in a different room then him yet 😩