I have no idea what to do and I need advice badly
Well I am male and my 2 best friends are female and we are all 15. I'm going to call myself R and my friends are L and F. It all started about a month ago when me and F both told L that we fancied her. L then decided to take some time away from us because she needed to think about lots of different things. And one day me and L talked and we both promised not to do anything that might hurt the three of us or lie to each other ever again. It got awkward after this but then we all were friends again and all was well. However this week I learnt that 4 days ago F and L got drunk and decided to date each other without telling anyone. Then yesterday they both went to a party and hooked up(do keep in mind they are both 15 and girls) before someone found out and F drunkenly called me and told me everything. Now this has made me feel completely hurt because I asked them if something was up with them 2 days ago and they said no. This means that both promises me and L made were completely broken and now I feel really betrayed and hurt. They both feel really sorry for it but it doesn't look like they're going to break up anytime soon. The worst thing is they are both my best friends so there's nobody I can talk to about this (they don't want anybody else to know) and to be honest I don't know why I feel like because it's their own lives not mine. But I know It makes me feel really depressed and I don't know what to do or how to act so I came here because I need advice badly and the whole thing is starting to really affect me mentally( e.g. Starting to develop trust issues) do please any advice however it is would be helpful now or even just somebody to talk to about it.
Thank you for listening