Ian was not enjoying his outing with Mina. Her behavior around him was too normal, and while he desperately wanted her to be comfortable around him, he did not like it now that he was experiencing it. It was too sudden and just a little forced, but Ian was afraid to call Mina out on the off chance that she might actually be trying to forgive him.
There was something about Mina that made him want to trust her. Even in the beginning when she had snuck into his hotel room and poured out her unbelievable life story to him, she seemed trustworthy. Back then Ian wanted to believe her words; it was his anger for having let down his guard that made him react the way he did, and he had regretted it ever since.