The storyline was faltered since Stefan got betrayed by his own brother and girlfriend, they asked too much of a single character to sacrifice while the other two protagonists i.e Damon and Elena moved forward without an ounce of remorse.
Actually, it was evident that the writer tried to cover up for Elena's betrayal y portraying the relationship of Damon and Elena in a good light but hypothetically if we put ourselves in Stefan's place, we can feel the pain and betrayal.
I stopped watching the series since got to understand that the writing is going haywire and is dodgig the actual principles of life i.e. loyalty and trust.