Ending a relationship?

My boyfriend of 4 years broke up with me because he likes someone else.. our relationship was deteriorating as we were arguing everytime n for petty things.. so I ended it on a good note by saying bye and thanking him for his honesty.. he did not say a word.. however when I told him that I was thinking of breaking up because our relationship was becoming toxic.. he said 'no you were not and maybe our relationship was starting become toxic..' why did he denied that I wanted to break up too.. did he want to have the upper hand in the break up and crush me more?
Ending a relationship?
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