Lo'ak is often holding or touching you. Your hand, forearm, skirt, tail, your pinkie with his, holding you waist, having you lean on him, etc.
It's because of anxiety. Plus, you two are touch starved.
Not just from him, but from you too. His anxiety comes from his daddy issues, from how Jake treated him like the disappointment, the screwup. He knew you didn't see him that way, you saw him. But he still couldn't help it. Why would you stay after hearing all of his fears, failures, flaws? Why do you listen when he talks and talks and talks?
Your anxiety is the fear of losing him. Whether it be from his own thoughts, from an outside source, anything. You saw him as a wonderful man. He provides for you, he loves you, communicates with you, sees you. He knows everything about you and still stays without hesitation or question.
Who wouldn't be scared of losing someone like that?