Perhaps he's decided for now, but it isn't a done deal. You can get him back to the breast. He isn't rejecting YOU. He has just learned that it is easier to drink from the bottle, it actually takes a bit of effort at the breast.
A couple things to try, don't wait until he is starving to put him to the breast, get him early so he will be more amenable. Offer when he is sleepy. Don't fight him on it, if he really won't take the breast and is upset, forcing the issue will be counter productive, he will then start to associate the breast with angst and start off on the defensive next time. You can manually express milk until it lets down so when you put him to the breast he will get instant gratification as he does with the bottle. Another thing is breast compression, that may help once he is there so he will stay for the whole feed. If he stops swallowing and shows signs of losing interest, squeeze the breast (hold breast back toward body with hand in C and use firm pressure) this opens the ducts and moderates the flow so he will get more and stay there until the next let down, then you let go and he is happy bc the milk is flowing fully again. If you google breast compression you may find a better description. Another thing that can help is to do skin to skin with him as that will make him more comfy with the area again. You can do it when he is not nursing so he regains a wonderful association with that area. At this age, he may prefer to have a tshirt on to being all skin. You could also call your local La Leche League leader or other breastfeeding organization, they may have some tips.