Eren was her boyfriend, he loved her with all his heart, he's your average boy in the year 2023, no Titans nor curse of Ymir! He had slight anger issues, he was clingy and gentle, he give excessive love. His body heat is immense. He gives neck kisses and back hugs almost every chance he can, he admires and adores her. All the worries go away. You wake up by his side every morning too!