What Happened to... AR????

but the main reason for my msg today is that i actually need a quick update on wht is happening in this show becasue i used to keep up with DMG but then becasue of my school i lost track and now im a lil lost :P... i just need to know wht happend to AR and why Riddhima is not married to armaan and where did this sid come in between...... i tired to look it up on youtube but it was very hard so if someone can help me out it would be awesome :).. i would love a quick update after when AR's marriage date got fixed.. so if someone can help me out it would be very appriciated :).. as well what happend to muskaan , rahul and atul and them becasue the last DMG epi i saw was when it was i guess the sagun of AR and there engagement date was fixed so if some one can tell me after that it would be good thnx alot :) :):):)😛😊😉