The correct option is D get over
A phrasal verb is a verb combined with an adverb or preposition to provide a meaning different from the literal meaning of that individual verb. The underlined phrase in the given sentence is a phrasal verb, it means 'to like each other' and does not provide the relevant meaning to the given sentence hence it needs to be changed and option A is incorrect. 'Get over' means to 'recover from something' like recovering from a heartbreak or a shocking incident, it is relevant in meaning to the sentence, which implies a shocking incident hence option D is correct. 'Go over' means 'to examine or check' as in' go over these documents and check if it's legitimate'. It does not refer to the statement, as examining "this incident" would only consume the person further in the emotions he feels, the opposite of what's given, hence option B is incorrect. 'Get away' means 'to escape' or 'to go to a place for relaxation', here it isn't relevant to the statement and sounds grammatically incorrect 'get away this incident', hence option C is incorrect.