Isla: Why didn’t you tell me you were dating Mike?
Linda: I thought you wouldn’t like it
Isla: I don’t care what he does
Isla: Or who he dates
Isla: This chapter is over for me
Isla: All I can tell you is good luck
Isla: Maybe it will work out for you
Linda didn't tell Isla about dating Mike. Isla is ok with it and hopes it will work out for them.