And from what I understood, his parents were alphas too (as a kid he heard people saying "he's the only beta", "swapped at birth" etc). He has a lot of self-hatred which he seems mostly to have turned outwards previously - now it's started turning inwards more strongly, hence wanting to die. His family seemed quite nice though, and overall he certainly didn't deal with his issues well. And no excuse for hurting other people in an even weaker, more exploited position than himself.
I know right? his family seems like nice people and his brother were nice one as well but it only made me him feel even worse, seeing his brother being better than him at everything broke his pride as a big brother, plus their neighors are even was talking like him not being real sons of his parents, it probably left a scar on him as well, of course no one of these are giving him a reason for his actions but yes I can understand him.
okay I'm not try to excuse his actions but living in a society where if you are not an alpha most of people won't show respect you or no matter how hard you work, an alpha can take the position he worked hard to get, your lover can choose an alpha over you bc social position somehow I can understand why he feels like that and it's not only about jealousy tbh