He saw his reflection in the water and realised he could never be spiderman, and thusly he couldn't take the unbearable desire to be what he wanted, he tried dressing up but it just wasn't the same. He tried to get radiated spiders to bite him but they just died. He was so upset, so he finally decided that in heaven, he could be whatever he wanted, so he walked to the nearest gun shop and bought a nice cheap .32 pistol and shot himself in the head.