Potty trainingreally hard with 3 year old

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I have 2 children, boy 3 years and baby girl almost one year. Boy wont even consider going on toilet. He comes to me when he has done something in diapers and says pee or poo and wash..how nice is that, but if i put him potty with baby seat he just screams and do nothing. Sometimes he just goes behind corner and make it in diapers then come out like nothing has ever happened. Sometimes seems he feels ashamed and that's why goes behind corner to do it...is that logical i don't know. Other hand my baby girl who is almost one year is already sitting on small plastic potty and makes everything in there. She notify me by making that kind of pooping sound that now now something is coming, so i just run to potty with her and she make it. Boy doesn't care about it just like its normal to do it in diapers. When boy was smaller he also went kind of sometimes to potty, but now just like he lost it..