Neil very well knows that Ragini tends to overreact at times, but that does't mean that he should walk out on his kid. For him to say that he is committed to 3 of his kids is extremely rude as a father. He went to India, supported Nishi's decision to get married, supported Arav into opening a business, told him to go hide at an old house when there is gangsters looking for him; he basically ruined "Ragini's" kids' lives and now is committed to three of his. He can be divorced, but no matter what his ex tells him, he has the right and the duty to be responsible for all his kids, especially when he is the cause of their spiralling down life.
For goodness sake, their kid is in juvenile detention; they all are acting like he is away at summer camp. Ragini will get married when he is back. Neil doesn't even care bc he only has 3 kids. Is it really that easy?
Neil should have been able to overlook Ragini's hatred and still stay involved in Arav's life; Arav is going to need more help when he is out.