Re: Loyalty Issues
It is often difficult when dojos of similar styles are close together. Few remain friendly and strangely, in the UK I saw people switch both ways - sometimes one guy came this way, sometimes others went away - certain dojos appeal to certain people I guess. As for me, I was happy to train in both and for the most part just kept my mouth shut.
If I were you I'd continue as is but shift slightly to the new teacher over time. I suspect that is what you will do anyway,