You've probably seen this circling around, but has anyone actually gone and read the full article? Because the sentence after that is "We still [make time to hang out] every once in a while... But realistically it’s not really possible in a race weekend.”
So no, they haven't stopped being friends. Logan's just explaining that they talk less because 1. They're on different teams now and 2. The paddock is always busy and there's not much time to talk to people.
Full article: here, take a read for yourself. It's pretty short but it's nice and talks about how Logan feels about the upcoming season a bit too.