Help please

My boyfriend and I split up 2 months ago then got back together. We are now engaged and we talked about the time where we were apart. We both slept with 1 other person and he wants to know everything about it so if something were brought up he wouldn't have any surprises.

It's horrible. I'm being honest with him but. I don't know where to go from here to make everything better. How do we act around each other? What do we say? He doesn't want to sleep in my bed so he will sleep on the couch. I told him to sleep in my bed when he was comfortable. So what now???? How can we fix this