<human>: Title says a lot.
My bf and I are in a good place now, really. We had an incredible bumpy start, and it all escalated when I found out he had been having an affair with a (former) friend of ours. This was about 6 months ago (the reveal). We totally crashed and burned, obviously, but from the wreckage we build up a new, solid, honest relationship. However, especially in the beginning (and still, but a little less) I was disgusted by the places, memories, phrases even, and the physical stuff that was 'contaminated' by the betrayal. Including the bed. He was super remorseful, took these feelings seriously and accommodated me in that he actually threw away his bed (amongst other things). 

He has been sleeping on a crappy futon since then. He doesn't have money to spare to buy a new bed. His back is absolutely killing him now, and I feel bad for it. I try to give him massages, but I have medical problem which means I can't properly do it without hurting my wrists (though I try). 

He is getting cranky and frustrated because of the pain, he won't blame me, he really is very attentive to my feelings, but I still feel like I'm responsible. 

What can I do to make this situation suck less for the both of us?

*Extra info: (He doesn't have spare change for a new bed/physical therapy, etc) He's really really healthy and fit and active, btw, so it's just the bed, not other factors. I have some spare change, but he hates it when I give him things, and something as expensive as a bed, he really wouldn't like that.

Can you condense the text into a few key points?
<bot>: I feel guilty about my bf's back problems caused by the lack of a proper bed/mattress. He has thrown away his good bed on my request after he cheated on me on the thing.