[He felt less shamed or that she didn't trust him and more just that perhaps she couldn't see him beyond his past. That his experience, or his past partners were this insurmountable wall between them when that was the furthest thing from the truth.]

Possibly... but possibly not. I've seen plenty of humans be content with singular partners over their short little lives. If all I get to have you for is the rest of your life, then how could I find that time boring?