Feyre and Rhysand are the final couple of ONE A Court of Thorns and Rosesbut Feyre almost marries someone else during the second part of the series. Although the first ACOTAR book combines Feyre with Tamlin, its sequel reverses the expected outcome of Sarah J. Maas' fantasy series. Rhysand interrupts Feyre's wedding, much to her relief, and the two gradually fall in love during their trips to the Night Court. One wonders how things would have turned out if Feyre hadn't mentally asked for help before committing to a life with Tamlin.
It is possible that Rhysand still prevented the marriage ACOMAFgiven what he knows about Feyre and how much he despises Tamlin. However, this would contradict Maas' portrayal of Rhysand's character, which paints him as the type of person who lets Feyre make her own choices – at least initially. Thanks to the mental connection the two share at the beginning of A Court of Mist and Fury, we will never have to figure out how things could have turned out differently. But it's an interesting question, especially given some of the inconsistencies with Rhysand's character.
Rhysand already had reasons to stop Feyre and Tamlin's wedding at ACOMAF
Feyre's silent plea for help is all Rhysand needs to hear before he stops his wedding, but it's possible he would have stopped her from marrying Tamlin anyway. Rhysand knows that Feyre is his mate before the incident, and the two obviously develop a bond while under the mountain. While being companions doesn't necessarily have to end in romance in the ACOTAR universe, it seems unlikely that Rhysand would have let Feyre marry someone else without at least informing her of their bond.
Rhysand realized she needed someone to intervene and knew Tamlin wasn't treating her like she deserved.
Additionally, Rhysand knows Feyre and Tamlin are fighting even before she panics at their wedding. Because of their connection, he notices that Feyre is having nightmares and struggling with PTSD, and he realizes that Tamlin isn't worried about it. He admits as much in ACOMAFso he had a good reason to postpone her wedding, whether she asked for help or not. Rhysand realized she needed someone to intervene and knew Tamlin wasn't treating her the way she deserved.
Add in the fact that Rhysand and Tamlin have a tumultuous history together, and there are several reasons why Rhysand may have crossed that line. There's only one argument for why he might have let Feyre marry Tamlin anywayand it's fragile – especially after A Court of Silver Flames.
There's only one reason Rhysand would let the wedding take place in a court of thorns and roses
There's only one reason why Rhysand might have let Feyre go through with her marriage to Tamlin in ACOMAFand it's the fact that he usually respects her enough to let her choose. Once Feyre and Rhysand are together, Maas makes it extremely clear that they trust each other – even when that means letting the other person do something dangerous or that they don't necessarily agree with. Rhysand clearly cares about Feyre's well-being, so he also wouldn't risk worsening her emotional state if there was a chance she still wanted to marry Tamlin.
Feyre would need more information to make a proper decision about marrying Tamlin, as she didn't know Rhysand was her mate at the time.
That being said, Feyre would need more information to make a proper decision about marrying Tamlin, as she didn't know Rhysand was her mate at the time. This could have led to Rhysand interrupting anyway, as she at least deserved to know her options. A Court of Silver Flames' Rhysand's worst decision undermines the argument further that he would have let her choose, as he withholds crucial information from her throughout this issue, raising questions about whether their dynamic is as healthy as it seems.
We'll never get a real answer as to what Rhysand would have done if Feyre hadn't asked for help, but it seems likely that he would stop the marriage regardless of how things turned out. He would at least give Feyre time to be in a healthier mental state when making the choice, and would probably want her to know about the mating bond first. Fortunately, she makes the decision to intervene during the second Cutting thorns and roses booking much easier by openly asking for help.