He felt that there were two reasons. First, Sanfu felt that he wasn't good enough for Pei Fufu. Second, Sanfu still wanted to work hard to support Xue Yan's studies. If Pei Fufu married over, she would live a hard life. However, if Sanfu didn't want to, Pei Fufu would go to the imperial capital and marry someone else there. This could be considered his only chance to marry Pei Fufu. Therefore, after serious consideration, Sanfu was afraid that he would regret it. Therefore, he chose to seize this opportunity and marry Pei Fufu.
However, in this life, Dongyu had not returned from the capital city. Naturally, he would not have the opportunity to give Sanfu a choice...
Therefore, Sanfu felt that he was not worthy of Pei Fufu ...
In other words, Sanfu now thought that it would be impossible between him and Pei Fufu.