ej .. this doesn't have to become a "your boyfriend is bad" vs. "defending your boyfriend" thread. None of us know your bf.
Hopefully he'll ease into doing more and more. I think with my husband, he was a little intimidated because it was all easy and second nature to me. As he eased into helping out, he began to pick out the things he enjoys and is good at (he LOVES the manure rake, he loves to spend time just grazing his horse on the lead, teaching his horse stuff, tacking and untacking, rinsing, fly spraying, doctoring etc.) I pick up where he lacks (brushing, feeding, watering, coaching when he gets stuck, calling the farrier and vet, looking out for health issues, etc.)
It works. Encourage him and help him along and he'll be confident and helpful in no time -- hopefully!