The Lost In Ascalon storyline is based on actual Guild Wars lore. In the game, when you reunite with Gwen, she's not too quick to discuss her history. To reveal Gwen's past, you'll need to complete many quests to learn her secrets... or you could just
read the related Guild Wars Wiki articles.
Even though there wasn't a kissing scene between Gwen and Photics, Devona is upset with the situation. Even if Guild Wars had a kissing emote, I wouldn't have used it here. Photics is happy to see Gwen again, but he's not in love with her. Does Devona know that for sure? Considering that Photics left Devona alone in Elona, her feelings are not pleasant. Devona fought against Nightfall, only to find her love with someone younger. Mordakai warned against the dangers of Elona. The danger was not just in losing their lives, but in losing their love.