Dic: invest, one of its verbal usages revisited

2(a). To spend or devote for future advantage or benefit:

• ...invested much time and energy in getting a good education.

2(b). To devote morally or psychologically, as to a purpose; commit:

• "Men of our generation are invested in what they do, women in what we are" (Shana Alexander).

.... The American Heritage

3. ~ sth in sth/in doing sth: to spend time, energy, effort, etc. on sth that you think is good or useful.

• She had invested all her adult life in the relationship.

.... OALD

• CF: Throughout her adult life she had been invested in the relationship.