Arrow So4e15: Felicity walks again but its a sad scene

Yes! Felicity is walking but she is not very happy because she just broke up with oliver.
Why? She finds Oliver has a ten year old son she didn't know about. Damion Dark reveals this to her when he tells Oliver and her that his son is being held captive unless he drops from the mayoral race which he does for fear of his son's live. Samantha comes over to star city after Barry as CCPD tells her to speak to oliver concerning her son's dissapearance,when she comes over oliver is forced to tell her he is the green arrow.
The episode also features a female character based in Detroit and goes by the name vixen who possess' a magic totem. She helps oliver track William his son and destroys Dark's source of magic. Now Dark has no power,we don't know if this is permanent. When this is all over and William is recovered ,Felicity tells Oliver she wants to break up and returns his ring, this is when she realises the chip implanted in her spine actually works and she can move her leg. She walks out of the place sad. Seems she wouldn't be needing her wheelchair much again. Which brings me to the question why the CEO of a billionaire tech company is not using a motorised wheel chair,even the bad guy Dark suggested this in this episode.
Dark may have been apprehended after triggering the break up of oliver and Felicity. But i don't think he has caused them enough pain. Remember at the grave yard, Felicity making oliver a promise to kill him, makes you wonder what could he have done that made Felicity sound that violent. Our precious Felicity that always sees good.
I must say at this point that Oliver's past is quite tiring and why wouldn't Damion Dark recognize the arrow at such close range in a lighted room.
Felicity is also angry with Barry for not telling her about this past.
Will Dark's powers be restored?
How long will it take for Felicity to forgive Oliver and Barry?
Remember the scene where Oliver goes to the cemetery,who do we think died?