the brisker rov in this weeks parsha says, although eliezer had so many nissim happening to him asisting him in finding out that rivka was the one for yitzchok, yitzchok didnt only rely on that. Rather, yitzchok waited until he saw that her actions were in the ways of his mother sarah and only then did he go for it.
that help a bit?
you shud definitely ask a rebbi or rov or someone btw not just some kid that happened to see a vertel this week