RUBY: What do I do if I need to use references in my program?

I really like the simplicity of Ruby, but now that I have taken on a real world project, I'm wondering if simplicity is also its fatal flaw...

Ok, so I am writing two classes. The first class is called SimpleCondition. It mimics some unary and binary conditional evaluation operations; for instance, the method csc_beq (Create SimpleCondition: Binary EQuality) takes two object references to test the equality of objects A and B (A == B) at various future points in the program and does something (optionally) if the condition is true by calling a passed in block reference, along with other information specific to my design. The second class is called ComplexCondition. It is just compound cases of SimpleCondition. So how am I supposed to keep track of these two objects that change throughout the program? If I use the = assignment, it might copy the object reference, or the = might be overridden...I simply have no way to tell...and that's a problem I don't know how to overcome.

At least PHP has the =& operator, and assignment of reference can be guaranteed, but there doesn't seem to be anything similar in Ruby. I'm stumped and don't know how to proceed. Hopefully someone has some suggestions...