[truthfully, it's him clarifying the reasons behind his choice that help her ease up a bit. she doesn't want it to be all about her. as much as she's taken with him in return, she doesn't want every decision he makes in his life to revolve around her. just like she wouldn't make every choice in her life based on him]

[she relaxes, leans forward a bit, and thunks her forehead against his shoulder]

Then I accept your choice, and acknowledge that it is yours to make.

. . . and I honestly look forward to seeing what sort of man you become in the meantime.

[not that she thinks he needs improvement now because she likes him the way that he is. but she can admire him wanting to be better. and she'll do nothing but encourage that]