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Shane wanted to take Rick’s place
Shane loved Lori and was shocked when Rick returned. He always wanted to take the place of Rick especially after he left.
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Rick started distrusting Shane
Rick started becoming uncomfortable around Shane as he no longer trusted him. This resulted in a lot of tension.
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Shane tried to kill rick
Shane tried to kill Rick twice. It was clear to Rick that he must get rid of him sooner or later.
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Shane became a threat
As Shane’s intentions weren’t that clear Rick realized that Shane became a threat. It was clear that he will have to get rid of him one day. (See Why the Walking Dead is so popular?)
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To defend himself
Shane lured Rick away to kill him. Rick pulled his knife in the last moment and did it first. (See Why do people binge-watch TV shows?)
