So what if it’s tremendous[ly] depressing? It’s depressing that basically no animal dies of old age in the wild. It’s still the reality.

Your comment doesn’t really seem to be trying to substantiate your claim, so much as it’s trying to paint a picture of how depressing his description of reality is. From that, I’m pretty confident you’re trying to define some ideal definition of love – which, if he’s correct, would not be ‘wrong’ but would simply not be common in the real world – while he’s trying to factually describe the motivations for human relationships in the real world.

(I’m not sure I quite agree with his gloomy picture, but I don’t think you are even coming at it with the same intent.)