My boyfriend keep add, commend girl's pic in facebook?

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This is my story. I was with my boyfriend 2 years,i know he loves me but i saw he is keep add girl in facebook and commend her pic like this: hey beaitiful , you look awesome, cuties, supper ....... But in my pic just commend : nice.. gud like he charity for me. I am so upset about this. He hidding his friend list in facebok, i dont know which friend in his list, but my friend told me that he has so much comon friends with my friend, and usually saw he commend and likes girl picture.Anh one of my friend show me his chat that he said he loves her. It hurt me so much, SHOULD I DO BACK WITH HIM?, LIKE THE WAY HE DID WITH ME? like and commend man pic, add man facebook, like the way he did with me to make he feel like the way hurting im felling?would you please, Any body give me advice ?