Colle and mate

Got this line in a colle with b3 and c3 against Bb4+. Looked at it and made a stab at the king who was hard to defend for black.

 

Last move was Qh5 and black continued -,g6 then Qh6,Qd5 I could see what he was aiming for! Pawn on for e3 with tempi cause of threath of mate on g2.