I prefer not to co-sleep but I do if need be. Like you our first bub did not need it and she always slept better on her own. This bub is different and needs a bit more comforting at times.

My only suggestion would be to try some thing else, such as putting him in a cot and see what happens. He will probable protest for a bit (like a few days) but perserve and see what happens.

I know some people put the cot beside the bed so that you can have your hand on bub and bub has his own space.

Also my SIL co sleeps and has her bub in a snuggle bed. Unfortunately these take up heaps of space especially if you have double or queen bed.