I agree with everyone except the beta part. He's not a coward, he feels very real. He's a normal individual with trust issues that literally got traumatized by those assholes.
Everything*
He drew a line and decided to never love anyone or even let them love him--People are bound to get hurt. And I think it's cowardly of him to let his fear and trauma, dictate how he lives his life.
Instead of dealing with his fear & trauma, he's allowed it to effect his decision-making for years. When he made the choice to never open himself up to a healthy relationship--That he's only going to sleep with people, and that they would only use each other for sex... It's like he made the decision that he was only ever going to engage with people who want to use him. He even agreed to such an arrangement. And now he's found himself caught in the middle between these two predators who have only ever used and manipulated people...
Ugh, it all sucks!
Being traumatized doesn't make someone a coward. Dealing with trauma is extremely hard so i understand why he lived the way he did. This doesn't make him a coward. Also, you make it sound as if it's his fault those predators took advantage of him, when that's by no means not the case. Not trusting other people and choosing to not be part of a serious relationship didn't entail getting used by these monsters, in fact it was the opposite. He wanted to avoid people that would hurt him in any way. Trauma can make someone emotionally vulnerable so i can see why despite promising to himself to not get further involved with the Alpha he still did get swayed. He didn't exactly expect things to turn that way, he thought better of those predators, he didn't expect they would treat him this way. Naive is perhaps the better word, coward though no. It would be insensitivity to call the struggle someone goes through due to his experiences cowardly. You can't imagine how badly trauma dan affect someone, how much it can transform day to day life and how you view the world. It's by no means easy. Some people take more than a few years to break out of the protective bubble they create around themselves, some even require an event to make them see things differently. It's very, very hard. And now that those assholes did what they did to him, I wouldn't blame him if stopped forming relationships all together.
Omega is a cruel, scheming hypocrite with a chip on his shoulder, and a an unhealthy obsession with the beta. He's acting exactly like the alphas he so despises.
Beta is a messy coward who doesn't seem to have much self-worth.
Alpha is selfish. He's also clueless when it comes to feelings. In omegaverse tho, it's normal that he'd be hung up on the omega, because he imprinted on him, so...There's a reason why he's been stuck for so long. It's just at the cost of the beta's feelings.
Anyway, I don't like anybody in this manga. The story has got me tho :)