>>2222872He never said he was scared OF her - he said he was scared of going TO her (as in, the situation), because, as he says, "I wouldn't know how to act with her". I mean, you can't forget that he learnt that the person he knew for the last months just got incinerated, and doesn't know how far Rei III is still the same person.
It's just his usual "Don't wanna do shit wrong, so better don't do anything at all" thing, which is admittedly pretty unproductive, but not motivated by indifference or dislike toward the people involved.