I hope you don't persue a relationship with this person, besides being friends. Getting involved with a married person is not a good idea, you'll just be putting more pressure on the other person and yourself, and maybe ruin a good marriage. I would just try to be friends if possible, don't get into something you can't get out of either. I understand you want someone to want you, but this person seems to be off limits, you'll just end up hurt in the end if you are already jealous of his wife and kid.