Saint Paul says love is generous. The “same idea” cited in this passage is a prelude to the Kensosis Canticle of Philippians 2:6-11. If you want a sidebar, check Saint John Paul’s catechesis on it here. Then come back and read:
101. We have repeatedly said that to love another we must first love ourselves. Paul’s hymn to love, however, states that love “does not seek its own interest”, nor “seek what is its own”. This same idea is expressed in another text: “Let each of you look not only to his own interests, but also to the interests of others” (Phil 2:4). The Bible makes it clear that generously serving others is far more noble than loving ourselves. Loving ourselves is only important as a psychological prerequisite for being able to love others: “If a man is mean to himself, to whom will he be generous? No one is meaner than the man who is grudging to himself” (Sir 14:5-6).
For your reference, remember that Amoris Laetitia is online here.