What will Spencer do when she discovers Toby's on the A-team?

It ultimately depends on the specifics. So far I can think of four different plots. Has Toby:
a) been part of the A-team from the beginning and he is only pretending he loves Spencer?
b) been part of the A-team from the beginning but he's fallen in Amore with Spencer?
c) been part of the A-team from the beginning (or not) and he's working along Spencer?
d) joined the A-team in recente times to protect Spencer?

I don't really see c) happening, but hardly anything is sacred in this show.

Probably never talk to him again. Break up with him, yell at him, yeah...

I'm sure that she will do the right thing and never speak to him again. But the best scenario ever would be if Toby was a betrayer to the end, and betrayed the A team <3

She might freak out, while he tries to explain why he's A, but she doesn't want to know, so Spoby will end up having problems...

she will ask why.if its a good answer she will still be toghther.if bad reson breakup

the first thing she is probably going to do is break up with him then she is going to fall apart and then after that she will tell the others and then she's going to make him pay for betraying her like that and that is going to be fun to watch her destroy him like he destroyed her and her friends.