The Rebels decide to rescue Peeta in Mockingjay because without Peeta they won't have Katniss's help. Katniss is severely depressed with him in the Capitol's hands and she can't think straight while Peeta is with them.
That is the only reason why they rescued Peeta.
Not because they care about him.
They only cared about Katniss because she is the Mockingjay.
Chat with our AI personalities
Yes, the Rebels rescue Peeta, and Katniss is overjoyed to see him. But when Katniss enters Peeta's hospital room Peeta tries to choke her almost killing her. The rebels soon realized he was hijacked (his memories were altered with tracker jacker venom) but eventually he becomes normal again and he and Katniss get married and have children.
She is someone who is familiar to Peeta through his childhood memories from District 12.
They do it throughout the book, at random times.
Josh Hutcherson is the actor of Peeta is real life. As of 2012, he is alive and well.
Katniss is married to Peeta at the end of Mockingjay.