If they are greyed out that means you've lost their path due to your decisions.
No fucking way I'm running that shit from the beginning 😂
There's a handy 'skip' feature where you can speed through stuff you've already seen to cut down the replay time.
And maybe check a walkthrough to see what choices caused you to loose the girls.
Also, if you want to play with a walkthrough now, I have a mod that can make it more convenient for you.