E.S.
M. - having your little guy sleep in the bed with you is not the worst thing in the world. He will eventually sleep in his crib. I have a 5 month old and from birth to about 2 months he was sleeping in a co-sleeper. We were (and have been) exclusively breastfeeding so it was working well. I was still sleep deprived, but he was sleeping. Well, around the 2 month mark, I fell asleep with him in my arms after a nursing session and never slept as well as I did that night. So, for the next 2 months, he slept in bed with us. Nursing him during the night was a dream....we'd both sleep well and fall asleep together.
At around 4 months, he started moving around A LOT more and was starting to push me out of the bed - literally! So, we started him in the crib, the day of his 4 month pediatrician well visit. First night was a little tough, but I put a piece of clothing in there with him that smelled of me (and of breastmilk) and that seemed to work. After less than a week of being in the crib, he was sleeping 7+ hours straight without waking up.
Now we nurse right before bed, and then usually only once during the night, somewhere between 3 and 4am. Hopefully soon he will not need that one night feeding, but I actually don't mind it.
So, my advice to you is to do what works best for you - not what anyone tells you is right. That's the advice I took and so far, the transition has been smooth.
Best of luck with it - and, like everything with babies, this phase is only temporary! let us know how it goes!