Bf wont like my facebook pics or post pic of us, but 'hearts' other girl's posts.?

Ive been dating him for awhile and in person he is so good to me, he doesnt mind showing me to everyone, he takes me places amd talks to people. But on facebook it is like our relationship doesnt exist. When we first met, for like a week he was really active with me, he put a picture of us and 'hearted' my facebook pics (when you make the heart instead of the like) and now he doesnt do any of that any more. I commented on a few of his posts, i said he looked handsome, and he never responded or liked my comment, when he used to do that, and he responded to everyone else who commented. (It has happened a few times now).

He also hearts other girls pictures but not mine. And this is on facebook, so you have to hold down the like to get the heart and he does that. Once and a while he will just give me a like but never a heart anymore.

But the weird thing is that when i see him in person he acts like he is in love and gives me all his attention. The change is only on facebook, and it bothers me because he gives them hearts and not me.

Sorry if i overreact, this happened with an ex and he broke up with me when i was 18 because he met another girl online. I get alittle paranoid after that.