So sorry you are going through this. This would drive me absolutely bonkers. He is definitely doing this to rile you up. It was totally appropriate for you to demand he remove it (wth does he think he is??) but other than these absolute necessary times don't waste any breathe on him. He's a scavenger poking around another man's wife. I agree with Mr. Bond you can't really stop him from being around your kids unless you can prove somehow that he's a threat to them (in which case you may have to go to court or police to prove that ... and that's assuming that's the family law in Malaysia).
Try to fous on yourself and your daughters, some focus on wife if you think there's a chance, and zero focus on that scavenger unless it affects your kids. Ew, what a creep.
Me 35 H 34 DS- newborn 8/13 T 8.5 M 7 H's EA - 10/11 INILWY 5/13 DBing 6/13 Don't know WTF to do 1/14