As you all know that laakhan is aggressive, hot tempered, over possessive (abusive too... His snatching earning scene) he has Lotta bad attitudes and reasons behind this attitude are he is not expressive. He can't share his feeling to anybody. His upbringing or sanskaar also not good. That's why his outburst of feeling his hiding emotion turns into anger.
If you are watching this show from the beginning then you will get to know that he hasn't express his feeling with anybody yet. Is there anybody with whom he can share his feelings, pain, tears?? Even poonmy is lucky she has some friends with whom she can share her pain, tear, worries, anything (I'm talking about priyom and someone her school friend... Dunno her name) on the other side lakhan has selfish people. His mother, who always trying to get money position power which is more important to her than her own son. His so called friend Chuna yadav who claims that he is his well wisher both always trying to brain wash him against their brotherhood. But he never goes against mitlaish. In fact he always respect him by touching his fit Mitlaish slapped him but he didn't utter a single word. He insulted him in their work place front of many workers and his father-in-law. But next day in b'day celebrations he forgot that all gile-shikve. This all quality shows that he is not bad at all. He needs somebody to understand him, specially poonam as not b'coz she is his wud b wife. But only she can do it. To understand some that not means you are going to cost or sacrificing something big. It costs nothing but gives a little happiness or peace both of them. But it is up to her and even she is not wrong that she finds happiness in priyom. But if their pure friends turns in love in upcoming story then it will highly affect on lakhan as punmy is his akhari ummid. Then i can't see him in such situation. So he should have to be or will have to be negative. B'coz we can't see him in vulnerable situation. That's why I'm saying do hate laakhan otherwise your sympathy for laakhan can not handle by you, can it? (it for those who can't see there hero's in heartbroken situation like me 😊 )