Kylie Jenner and Timothée Chalamet may be pumping the brakes on their relationship, an insider claimed. Since the reality star, 26, has been busy promoting her new vodka seltzer line, Sprinter, in L.A., and the actor is filming the new Bob Dylan biopic in New York, the distance has apparently been hard for the two to deal with. “They’re hardly together anymore,” a source dished. “One might even say they’re on a break. Their lives got busy, and they drifted apart. Of course, once their schedules quiet down, that could all change.” However, “they still care about each other, so maybe they’ll pic…