Re: My thoughts about my dojo/sensei
If you really like your instructor and your dojo, then stay there. If you want to, go check out the other dojos. See which one Feels right. It may be your current one, it may be another.
In my opinion, a teacher who encourages you to explore your options is preferable to one who would forbid you to attend someone else's classes. I have no idea if this applies to your situation or not.