User blog comment:Timeoin/1.5 Patch For Consoles/@comment-68.114.141.162-20120408003426/@comment-58.164.59.182-20120412140036

Yes you can now marry Lydia.

And Esbern is probably travelling with you because you at a certain point in the main quest where he is following you (eg. to Skyhaven temple). He is a VERY powerful mage ally, who doesn't die. I advise you keep him?