I don’t feel sorry for Lucas at all. Leah’s been very clear about their relationship and rejected him since they were young, but he still hasn’t given up. He doesn’t respect her no. If Lucas truly loved and respected her, he’d give it up. I hate how this behavior gets portrayed in fiction, it’s not admirable or something to pity him for.
Compare him to Roxant, who clearly likes Leah but would be alright with a divorce if she found a man she loves, and was very upfront about just wanting the best for her.