What should I do if he's liking other females pictures on facebook?

[adina]

He recently liked 2 of the same girl's pics. She had her boobs all out and ( I admit) she was very pretty. He also comments on other girl's pics too but he doesn't comment necessarily on their looks but kind of just teases them. For instance, he told this one girl she had big lips. But he did comment on one girl's pic saying "nice" whatever he means by that. He has never liked or commented on any of my pic even when I had 55 likes in my recent pic (of only my face showing) with guys complementing me. I don't want to bring it up and sound jealous or insecure because im really not. I don't think he knows that I can see the pics he likes and comments on because it pops up in my news feed and I don't want to tell him either because it'll just make me sound like a stalker. I understand that he's a guy and that maybe there is nothing wrong with just a like, but i guess it just bothers me that he would like their pics of boobs and butt but not my cleaner pics.

Also, all this happened right after we talked about keeping our healthy relationship going and how both of us have a hard time with trust. I told him that it takes a while for me to trust people and he told me that i shouldn't have a reason not to trust him. Then I go on facebook and see all that. How can I not be bothered by that? Should I be worried?