Does broken Timing belt bend valves on 1998 3 cyl. Chevy Metro?

No, the 1998 3-cylinder Chevy Metro (and most other similar small, fuel-efficient engines of that era) uses an interference-free engine design. This means that if the timing belt breaks, the valves and pistons are unlikely to collide and bend the valves. However, while the valves won't bend, the engine will stop immediately, and you will need to replace the timing belt. Attempting to restart the engine with a broken belt could cause other damage.