well, to cut the long story short.... mayank (damini's retarded child) raped kt..... and eku got blamed and he turned negative..... then he wanted to marry kt to take revenge from tulsi..... so he got lakshya kidnapped right before marriage and replaced him in mandap, with big sehra.... got married and blamed it on tulsi... so L, kt and everyone thought that tulsi forced eku for marriage...... then tulsi was sent to asylum and she escaped, got plastic surgery etc etc... i know its very short update, i hope it helps..
cheers