As the question is not included in this passage, I will provide a general explanation of what the passage means.
This passage illustrates the regret that Othello argues he feels over the death of his wife. Othello suffocated his wife Desdemona, who was completely innoceent, because of his blind jealousy. Upon his recovery from such impulsive actions, Othello laments his acts, and says that, even though he did not "love her wisely" he loved her "too well."