Yes, I do think you are being unreasonable, you also sound jealous and bitter.
As the child of parents who split up many moons ago I endured years of the continued resentment towards one another, each constantly about the other to me. The net result was they drove a wedge between me and them.
Facebook is a funny old world, you can see something on another's page and share it in an instant, it's the same as an off the cuff remark - not worth reading too much into as it has been given little thought.