Relations have never been good between the two, but they’ve recently degraded significantly. It started when India bombed Pakistan in retaliation for a terrorist attack that India claimed Pakistan was involved in.
At that point, any sane US administration would have scolded India in a way that made the Indian government worry about the future of its trade and other relations with the USA if they didn’t cool it. But of course, we don’t have a sane chief executive, we have an incompetent fascist who sees right-wing nationalists like India’s ruling BJP to be natural allies. So of course the fascist idiots came down squarely on India’s side.
Given how both India and Pakistan have nuclear weapons, and given how this is the most serious conflict between the two since they nuclearized, this is positively frightening. Thankfully, Pakistan seems to be acting conciliatory in recent hours (they’ve unilaterally announced they will release the pilot of an Indian military plane they shot down), but this whole thing could still easily escalate out of control and precipitate a most horrifying outcome.