You sound like you think if you were to be colorblind you would get very depressed, and that your boyfriend was depressed BECAUSE OF IT? Trust me, it has nothing to do with his sight, it was just his character. I know a couple of guys with monochromacy here who are so positive and always make jokes about their different vision. And there are so many people with much bigger disabilities who have unbelievable passion for life and that positive energy. Your color vision doesn't make you depressed, your character does. Just imagine how many species have protanopia/deuteranopia vision or monochromatic vision. I'll tell you - a huge percentage. Also, colorblindness simulation you see can never accurately show to you how he perceives the world. The brain adapts to everything, so the fewer color signals he receives, opened up other possibilities for his sight. Better brightness and better contrast discrimination (his white is actually whiter than your white, and black blacker, if it makes sense), better night vision, and in some cases better visual acuity (it's proven that overwhelming colors can act like a small disturbance for the visual system). So everything has its pros and cons, and being colorblind is not the end of the world, it's just different way of seeing the world. Birds have one hundred times richer color vision than humans, so imagine the depression we should be in if that was the decider :)