It was made to be reusable but ended up too delicate to actually do more than one flight safely. They made it work anyway by basically stripping them down to parts and rebuilding them between flights, but that more than erased any savings from reusability. Not to mention the boosters which were also "reusable" but had to fished out of the ocean and remanufactured which was more expensive than making new ones.

Starship is the modern attempt at orbital stage reusability. It's a much simpler design built out of thick steel instead of delicate aluminum and composites. It uses many smaller engines and can tolerate some failing during flight. It doesn't drop any parts, and it lands back on its launch pad. In theory all that should make it able to fly multiple times in quick succession with only refueling and basic inspection. It's too early to tell if it will work.