I've just put "like" in again (knowing it will be wrong) to leave another thought. We MIGHT actually only like the boy, and may not actually LOVE him. Since the sentence would be the same in either case, both options are therefore legitimate and should be marked as correct.
Inconsistent within the same lesson. In one sentence, it's wrong to write 'love' for the verb aimer. In the next, it's wrong to write 'like'. If it's aimons bien for like, and aimons for love, let's be consistent. Less a hassle on the computer but annoying as hell in the app to be locked out for typing the correct response and not guessing which answer the app wants.