I understand that this is weird question, but right now i don't know what to do, and i am between a rock and hard place right now, so i turn to you for some advice (being this is my first big campaign and never encoutered anything like this).

So a quick rundown why am i talking about, we've been playing d&d for almost 3,5 years now together as a group of friends. The group is DM (me), human paladin, halfling paladin, monk, barbarian and bard. I will refer to the irl person by the class too

First of all the monk. I have wrote here asking advice what to do with the monk (here) and as a lot of people adviced me, i talk to him about it, he said he is sorry and he will change . After a few month he made quite perverted comment about seducing and underaged NPC (who while was almost in adulthood to make her look more mature, the reason why her was 17 is that none of my PCs would try to do something like that). I shut him down and talked to him again, with the same results. He didn't say any wierd things for a while. Fast forward beginng of april when it was reveald that this NPC, and another NPC (who is her life long friend and another girl, same age) had feelings towrads each other(it was supposed to a young inocent kind of love, mainly so i could've crush my players spirit by killing one of them, don't worry killing beloved NPCs were discussed and encouraged by the whole group). Here goes another comment "about wanting to watch". I let it slide because we are on a limited time. I was planning to talk to him later. Then life happens and we didn't have a sigle session since.

So this is one of the part of the problems, but arguably this can be solved without dissolving the group. The other problem(s) are more devistating i think, because it is not a PC vs DM it is two players having a beef.

So irl last summer barbarian started dating human paladin's ex-girlfriend. Human paladin is rather old fashioned and was felt hurt and dismissed by barabarian that just started to date out of nowhere without asking him if he would be alright with it. So ever since then the air between human paladin and barbarian was rather cold. It kinda bugged me, but because during rp it wasn't that noticable, and human paladin promised me i wouldn't go any further i did noting.

So since we stoped playing because life stuff, halfling paladin got together with human paladin's other ex-gf. Human paladin felt the same here and while they have not met during d&d, non d&d meeting were quite unpleasant and rigid.

So putting asaide who is wrong and who is right in the last two thing, my reasoning here is: I have to either ask monk to leave or have the talk with him every half a year, three of my faive players refuses to rp with each other beacuse outside stuff, and poor bard just there to suffer the consequences.

Am I in wrong for having thought that continuing this group would only lead to miserable d&d experineces and the best would be if we just didn't continue? What would you guys do?