They are now both teenagers, so there is a rise in hormones. This can be when problems with compatibility, if there are any are going to come to light. Also, just a rise in hormonal tensions will occur even if they are compatible
Please do check and let us know the cage measurements - rarely are pet shop cages big enough, the biggest commercial is the ferplast plaza 160 which is only big enough for two. Four piggies need a cage of 210x60cm.
Two boars need to be in a cage of 180x60cm. Any less and there can be space related problems and fall outs.
Please do ensure you have two, if not three hides in the cage. Ensure they are all tunnels so no piggy can get cornered inside by the other and always has an exit.
They may not be going into the hide because there aren’t enough at present. If the dominant claims the hide as his own then he won’t let the submissive in, and then the submissive has nowhere to hide.
‘Crying’, could well just be submission squealing. Telling Tails that he knows his place at the bottom of the hierarchy.
You don’t want him to be fighting back - if he does that, then it could well be game over for them.
A Comprehensive Guide to Guinea Pig Boars
Boars: Teenage, Bullying, Fighting, Fall-outs And What Next?