The latest episode of The Flash season 2 was an origin-story of the Reverse Flash, aka Eobard Thawne. Matt Letscher's Speedster travelled to Central City, from an earlier time, and Barry got a chance to capture the man who killed his mother.
However, when he realised that by locking Eobard Thawne, he was disrupting the timeline, leading Cisco's death, Barry was forced to make some impossible decisions. He ended up sending the Reverse Flash back to his time, thereby restoring the timeline and saving Cisco's life.
Barry gave up the chance of saving his mother twice, first in the season 1 finale, and again in the episode aired on 26 January. The episode found Barry dealing with his breakup from Patty, who figured out that Barry is The Flash, and left Central City for good.
Executive producer Andrew Kreisberg spoke of Barry getting his share of happiness in an interview with Hollywood Reporter. He said, "As the hero, Barry keeps getting the holy grail placed in front of him and he keeps not taking it. To us, that's so interesting. The video that Thawne as Wells gave him at the beginning of the year where he freed his dad, he said, "You're never going to be happy." Barry has tried so hard to be happy, and whether that was with Patty or his job, he keeps not being able to be totally happy. "
"Again, the chance to save his mother is presented to him and again, he doesn't take it. The question of what will it take to make Barry happy will still hang around and it will be answered by the end of the year," he stressed.
Going ahead, after leaving the Reverse Flash and missing out on another chance to save his mother, Barry will renew his efforts to fight Zoom. Kreisberg shared, "It's only going to reinforce his desire to get Zoom. He can't get the Reverse-Flash because time won't let him. What's going to be happening in the next few episodes after this is Barry will renew his efforts to take the fight to Zoom."
On the heels of his breakup with Patty, the upcoming episode will find Barry entirely focussed on capturing Zoom. According to the producer, "Now that he's lost Patty, he's going to return his focus on stopping Zoom. He feels like, if he can just stop Zoom, then he can finally be happy."
The Flash airs every Tuesdays at 8pm on The CW.