Hi S.: You might just have to ask your husband to give the baby your bottled breastmilk for three or four days until the baby understands that you will not be "the source" forever. If that's not what you'd like to do, then....
...Maybe try both breastfeeding and the bottle in the same sitting. Let the baby breastfeed for a few minutes until your milk is out on one side then give him your bottled breastmilk to top him off before letting him switch to the other side. (Then just pump the other side if you need to.) If he still insists on switching to the other side, then let him. I can't quite remember how I transitioned my kids...but I think had one breast "dry up" so to speak before the other because I was weaning him off the side that produced a little less milk anyway. I think I pumped on that low producing breast a little before his feeding time so there wouldn't be anything left there if he did want to switch. I would switch him to the empty breast and then after a few dry sucks, I had my breast milk ready in the bottle...freshly pumped! I just remebered this trick as I was typing! Also, as my milk dried up on both sides, I started mixing 1 ounce of formula w/ my breastmilk...then after 4 or 5 days, I increased it to 2 ozs. of formula and so on. I was a bit lopsided for a week or two (ha!), but I just listened to my body and made sure that I didn't become engorged. (That happened to me once and boy was that painful!!!!!!) I hope this makes sense. If you have any major problems, you should also try to find a lactation consultant in your area. She can hopefully give you some ideas that you won't find in a book! Good Luck! And let me know if you thought this was a helpful idea for you.
A.