she has a solo path as well if you break up with Layla because of her
Mmm... yes and no. Yeah, you could technically open up a solo path with Elena but... it doesn't take away that to get Elena solo, you have to be a dick towards Layla, which kinda goes against Elena since she cares a lot about Layla. Also to get most rel points for Elena, you have to be on the layla path.
So if all the above is true, then why do you think Elena would accept a relationship with the mc at the cost of her friendship with Layla? Nah, Elena would choose Layla over any guy if she had to hurt her to get a relationship with a guy.
Also, remember in the train ride (after clubbing); Elena kissed Layla first before kissing the mc while being hammered. In vino veritas (Latin: In wine there's truth), right? =P