[It occurs to Enjolras that she must not know Marius all that WELL if she thinks SO highly of him as all of that. He won't comment on that matter now; since it is clearly not the time for it, but, well. He nods as she speaks there.]

I quite agree he should, and yes, if the girl is everything he sees her as, then surely his happiness should be what she holds most dear herself.

Perhaps though, time, [Or Eponine meeting someone else who is able to love her as Marius could not, he thinks might be some sort of a solution too] may improve things.