According to Temptation Island host Mark L Walberg, Hania Stocker proposed to Ash Lamiroult during the final bonfire as an apology to Ash. The couple came onto the show seemingly doomed from the start. Hania had been unfaithful to Ash and tended to refer to her as a friend in front of other people instead of confirming they were in a relationship. When they joined the show, Ash quickly made a connection with Taylor Patrick. The pair had a lot of chemistry and seemed to understand each other in a way Ash and Hania never did. The cast member also found that Taylor gave them the love that Hania never did.
It seemed likely that Ash and Taylor would leave Temptation Island together. However, when it came time for the final bonfire, things went differently. A few episodes before, Hania joined Luke Wechselberger as he went engagement ring shopping, and they both bought a ring for their partners. While things went well for Luke and Iris Jardiel, Ash quickly turned down Hania's proposal. The two ended up leaving the island alone, and during the reunion episode, it was revealed that Taylor gave Ash a fake phone number when they left Temptation Island.
Many wondered why Hania had proposed at all when it seemed unlikely Ash would say yes, and host Mark thinks he knows why. The show's host was a guest on the Reality Steve Podcast, where he spoke about the season finale and reunion episodes. Mark revealed he believes Hania didn't propose because he was sure Ash would say yes but instead as an apology to them for how badly he'd treated his partner. The host said the proposal was "in some ways an apology to Ash so that Ash would see a very dramatic and unpredictable response that would speak to his perceived growth."
Mark doesn't necessarily think Hania's intentions were selfish, but he doesn't think he was ready to get married either. The Temptation Island host thinks it was beneficial that Ash said no and believes that Hania may have even been relieved since he wasn't actually ready to get engaged. Hania began to grow and evolve as a person after Ash slept with Taylor, and he realized he could really lose his partner. By the reunion, he seemed like a much more mature and healed person who understood Ash's pain and why they weren't ready to get married.
While things did not go according to plan for Hania, it was definitely for the best. The two did not seem ready for marriage, especially after everything they'd gone through on the show. Mark's explanation for the proposal makes a lot of sense since there was no evidence Ash would ever want to be with Hania again. Luckily, he seems to have made a lot of progress since Temptation Island, and even though he lost Ash, he's gained a new perspective on himself.
Source: Reality Steve Podcast