yes you are being insecure, he is only liking pics not having sex or any real life contact with these women, is he? obviously you can see all this so he isn't sneaking around doing it, all in open view for you to look at. when you said you didn't like it and it makes you jealous and upset what did he tell you back? since you said he is still liking the pics.
When I tell the truth, it is not for the sake of convincing those who do not know it, but for the sake of defending those that do.
William Blake