Re: Hurt by SIL’s opinion of me 
Don’t be assuming like that, Humper. That, in most cases is the perfect recipe for disaster right there. Being shukky leads to all sorts of unexplainable problems. Next thing you know, you see someone else in the family acting odd, you’d suspect the sil 8 out of 10 times.
Just like you’re casual enough with your very sister, without knowing much of the history your sil and the neighbor share, there always remains the possibility of them being on a similar casual scale/scheme of things. A girl shutting a girl up is relatively easy, same could be said about a guy to a guy. A girl however telling a guy to go take a hike and mind your own business could well be a chore in some cases.
She deserves a second chance, or perhaps a chance to explain herself (I wouldn’t ask for it If I was you). What would royally suck would be to affect a nice new relationship in a negative sort of way, as well as dwelling into a sad phase in your case. Wise/educated one’s in their 50’s make atrocious little mistakes that you’d never expect them to, yet they do. Forgiveness ought to be the bestest of weapons a kind heart could ever possess. Easier said than done, but isn’t everything worthwhile difficult to attain/achieve any way?. Treat her just the way you’d treat your little sister.
Pretty’ness comes from the inside, the rest, simply fades away with time.
Cheer up. 