We need the lines and more information ;)
Answer:
The second one: You are, if I'm not mistaken, a good person for this experiment.
Explanation:
The first sentence, "You are, if I'm not mistaken a good person, for this experiment." does not have a comma after "mistaken", where there should be one. After "a good person", there should not be a comma.
True love is a strong and lasting affection between spouses or lovers who are in a happy, passionate and fulfilling relationship. An example of true love is the emotion shared between a couple who has been married for 40 years and who are still passionate about each other and care deeply for each other. Yea hope this helped!