Past simple vs past perfect

Tense that expresses actions in the past is called

Tense that describes an action that took place before another action in the past is

"chose" - the verb is in

"had chosen"- the verb is in

In the sentence "I chose to leave my boyfriend because he had cheated on me" there is

The part of the sentence that is in past simple is

The part of the sentence that is in past perfect is