I'm pretty sure the other two killed themselves
There's a reason why they're looking for him.
SPOILERS
They badly needed information. The Great Dungeon (the source of MC's trauma) is prophesized to appear again and they needed all the information they could get so they could send in people again, but this time, let them have a chance to succeed and not become another tragedy. When MC (post-reveal) told them that he would go too (since the ML was going no matter what and MC at that point wanted him to live), all of them rejected his proposition because they know how bad MC's PTSD is. The thing about the Awakeners is that the Gaia System only chooses to awaken people who are "Good" at the point when they're Awakened. Some of them become evil and twisted later on (mostly machinations of a certain organization), but the Good still outweighs that. So yes, a lot of them are annoying af rn, but they become endearing later on (much to my surprise lol).
SPOILERS
Forgot to add that the reappearance of the Great Dungeon was literally months away at the start of the series, which was why they were so desperate. By the time MC revealed himself (to a handful of people) and gave information, they only had a month and a half left. The other two who survived the Dungeon killed themselves after they phoned MC and told him their last wills (one of them was to be punctual at work, which is why the MC went to work). MC was like "WTF? How did you get my number?" He was raging pissed.
Regarding MC and ML's relationship, it seems forceful at first but they quickly become attached at the hip. ML catches on that MC is fulfilling his comrades' will and amps up his stickiness to a tee. ML does get his mock battle with MC but at that time, he's already fallen too hard and at the point of becoming unable to harm MC (even accidentally) because just the thought made him physically ill lol. So no battles between them happened.
Thank you! do you also know if the mc is doing the last wills because he is magically forced to or because he's doing it because he feel bad?
He's doing it because he feels bad. His former comrades only started telling him their ridiculous last wills when he blurted out to their captain that after clearing the Dungeon, he was going to kill himself. His best friend (who had been the youngest in the group) had just died then, and coupled with exhaustion and hunger, he kind of had a breakdown. They really wanted him to survive and live a life outside of fighting (one of the wills was that he never go inside a dungeon after the Great Dungeon, which he had to break because he was forced to. It's also why he just works as someone who just installs barrier and not be in guilds who proactively goes inside dungeons). He could just not do the last wills, but he does. He remembers most of the people there too (like those who didn't die early)-- like their likes, dislikes, quirks etc. and kind of knows that they only said their wills for his sake, but he does it because he remembers them through it (like a grieving process) since a lot of wills are kind of attributed to their hobby (like how the guy who asked him to bake cookies liked baking etc.).
Some of the wills though were last words for the family left behind (which for MC was the hardest thing to do) so the wills aren't entirely for MC's sake.
tbh, it bothers me how insistent everyone is. He can never catch a break... :( Also, I forgot this was a bl until the like ch 30, but the new bl scenes feel a little forced tbh...like when they sent a guy to Seduce the mc..? the ml carrying the mc instead of using skills? this could've been a shounen too, even though the bl is nice. it's kinda crazy how they are extensively looking for him just to fight once, or do they want to exploit him? like it's been 10 years and there are other survivors as well (I know one is traumatized, but there 2 more besides her). I guess what really bothers me in the end is how forceful they are looking for the mc ... like leave him alone, alot of love interests like the hard to get personality.