Dating Friends

So my friends lets call them L and J. L is 14f and j is 14m. So me and them have all been a trio for about I woud say around 7 months and for around six of these months we have been friends. Our friendship has had it's ups and downs due to Ls ex boyfrind. Now Ls ex boyfriend had been a real piece of shit to l and when they broke up J had expressed some feelings he had towards L. So out of sheer curiosity I started to talk to L and ask how she felt about J She had been telling me and J that she ws confused and didn't know how she felt about anyone since she broke up with her ex, so she told me that yet again when I asked. She told me later on when I kept telling her not to date him that she might have a crush on him, but won't persue anything. Moving on around a week later I get over the whole "stopping them from dating" thing. Mind you the main reason I don't want them dating is because I fear that it will hurt and ruin what we have left of our friendship, mind you it is very strong. It still bothers me badly. Fast forward a week when me and L are talking I let her know that I don't care if she dates him, she can do whatever she wants, I just wanted her to know that I would have zero part in that whole thing if shit hits the fan. Moving to yesterday at a random time L grabs Js hand and they just keep holding hands for the rest of the night, but L tends to do this to a lot of people so I let it go and moved on but then later on Jcame ad asked me what that was about. I told him that I didn't know and to not think too much into it. Later on that night they are cuddling and obivously flirting, so I start making jokes about couples and things like that. Later on this morning they ended up being super flirty with each other and when I went out a few times, they ended up kissing and things like that. Now we zare sitting here now with two people in my room are "dating" and now I'm here. Am I upset, slightly because I feel like I've lost something when I know I haven't. Another issue is that they are one of the cringest couples behind closed doors that you have ever seen. (BTW the past 2 days they have been sleeping over at my house). That's how my friend got together