IAC in any case
ICLW\YLuv I can't live without your love
IDK I don't know
IDntDsrveU I don't deserve you
IGotUBbe I got you babe
IIRC if I recall correctly
IJC2SalLuvU I just called to say I love you
ILU I love you
ILUVU I love you
IMBLuv it must be love
IMHO in my humble opinion
IMNSHO in my not so humble opinion
ImRdy4Luv I'm ready for love
ImT14U I'm the one for you
IOW in other words
IOWAN2BWU I only want to be with you
IPN I'm posting naked
IWALU I will always love you
IYKWIM If you know what I mean
IYSS if you say so