A holes or nah?

Ok so I’m in quite a big friend group 7+ (varies on what we’re doing but there’s 7 main people as we all live together in student accom) and there’s this one boy we’ll call C. Now I really liked C and everyone in the friend group (including me best mate called K who will be relevant later also in the same friend group) convinced me C liked me saying things like “ U and C always flirty tease each other” blah blah blah and my dumb ahh got quite drunk at pre’s and told him how I felt in a Wetherspoons 😭. Ended up getting rejected cause there was another girl in his flat (we’ll call S) that he wasn’t over cause he found out she MAY (may cause he never grew the balls to ask) not like him and he liked her. That broke me and shattered my self confidence but fast forward a few months like 3. I’m slowly getting over him and we’re kinda back to how we were as friends until I’m hit with the biggest, what I consider, back stab. He and my best mate K started getting really close together out of nowhere which I initially thought was just as friends but was severely wrong. Fast forward a couple weeks they’re getting RLLY close so I was like F it I’ll ask if he likes K and his response was “nah I don’t I’m still tryna gaslight myself that I’m over S and I’m gonna download tinder anyway) and K said she was down bad for another girl in our group. Tell me why less than a week later from asking them my friend group have a movie night and I see C&K cuddling up together on the bed in the room we’re having movie night in!! Obviously that felt like a blow to the stomach. I ignore it and just chat with my other friends to distract myself. 2-3 days after this K talks to me and was like “yh me and C have gotten really close together, we’ve been hanging out with each other and have gotten quite serious BuT iF u WaNt Me To BaCk OfF I wILL” in my head I’m like you’ve put me in a lose lose situation. I either A tell u to back off and look like the biggest selfish dick telling you to not go for the guy who u like and likes u just cause i still like him (which she knew this whole time) or B be forced to see you all coupled up with the man I like almost every day. I went with option A :( Fast forward to present day they’re now dating. Now my thing is I’m not even mad they’re dating as at the end of the day u like who u like can’t help that but it’s the fact any decent person on both their parts would at least try to be a little sympathetic when we all hang out with each other but nah not them. I’m forced to see them giggling, flirting, cuddling, saying all the things they’ve done when they’ve hung out together TO ME etc. and I’m like if the roles where reversed I would at least be nice enough to not be all lovey Dovey in front of the person IK still likes me. And it’s not like I can avoid them. THEY’RE EVERYWHERE. We all live together just in different flats but K is in my flat so I csn hear them next door whenever he’s over or when I want to make dinner they’ll be in the kitchen cuddling on the couch and we’re all in the same friend group so that doesn’t help. Soo my question is ( apologies for this long ahh rant) are they being dicks the way they went about it? The lying, flaunting it in my face and just the emotional obliviousness?