Why is my JavaScript function continuing when I have told it to stop while another function runs?

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Not sure why this function is continuing to run. Function a() should always be running except when function b() is running. Function b() is initiated when a button with the class ‘btn’ is clicked. I can’t figure out why this isn’t working. Thanks!

    var bActive = false;
    
    if(bActive == false){
        a();
    }
    function a(){
        const toggleGreat = document.querySelector('.great')
        const rawr = document.querySelector('.rawr')

        toggleGreat.addEventListener('mouseover', function(){
        rawr.classList.remove('active');
        })
    }
    function b(){
        bActive = true;

        const rawr = document.querySelector('.rawr');
        const paper = document.querySelector('.paper');

        rawr.classList.add('active');
        paper.classList.remove('active')
    }

    btn.addEventListener('click',function(){
        b();
    }

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