If she is serious about marriage, she may just want to be with you for the rest of her life. Thus, she does not have to feel: One reason is that they live in a collectivistic culture.
Similar to many other marriage-minded foreign women, she sees you as a rare treasure. Plus, they are close to their families and friends.
Also, she may expect or even ask you for a second date.
Some people say that Medellin has the most beautiful women in Colombia, but you will be the judge of that.