Now, as he struck the match against the tinder and placed the small flame to the kindling, he knew that his reasons were gone. He had control of his strength, and his fear that he might hurt Mayson was nonexistent. They’d been dating for a while. He knew that he could trust her. She cared about him and he cared for her. Neither of them was going anywhere, and theirs was a relationship that had a future if he chose it. The time was right.
Well, there is two things - besides of Lois - why Clark shouldn't do it. First, if he really trusts Mayson, why hadn't he told her about Superman. Secondly, Clark thinks nearly only about himself - there are nearly any thoughts about Mayson as a person, besides physical ones: to him, she could be any woman.
In fact, they haven't any solid basis for the relationship.
Now, because they weren't interrupted by Lois, I presume Clark would have to make a decision.
PS. I think Mayson talks too much about Lois for her own good - if she doesn't do it to make sure that Clark isn't thinking about her.
