Originally Posted by littlemo
Yes Dennis has always been jealous of Phil and Sharon's relationship. Most people probably remember when they had that conversation just before Den came back and before they got together. Dennis was asking Sharon how she could let Phil touch her etc., and you could see Dennis's blood boiling inside of him. Just the thought of them together was torture for him. I don't think all of that has gone away.
Dennis doesn't trust easily, he loves Sharon but I still think there's a part of him which feels that she could betray him. I don't think Sharon would go back to Phil now she's with Dennis. But she had affairs before, so it's not completely ridiculous.