Why is this a blunder?

My idea was this; if I take his bishop first, then he takes with the king, ill take the pawn with my bishop, he takes and he’s up a bishop. After what I did I was up a bishop and he’s resigned. What do I not see here?

My idea was this; if I take his bishop first, then he takes with the king, ill take the pawn with my bishop, he takes and he’s up a bishop. After what I did I was up a bishop and he’s resigned. What do I not see here?