This picture is taken from the episode where Marge is buisnesspartner with Moe and spend a lot of time with him. Since Moe get to know Marge more then Homer in so little period, Homer feels like that his begin to loose Marge and Moe propose to her. Marge says no to Moe and go to Homer instead
It is not often we see that Homer is crying for the love of his life ^^ So we see here that Homer loves her very much, and I just loves the way Homer shows it ^^
I don`t own this pic, it belongs to FOX.