Thank you for allowing me to assist you.

In South Dakota, a successful Alienation of Affection lawsuit requires more than an affair. It requires that the person that's being sued set out on a calculated course to woo a married person out of their marriage. For alienation of affection, there has to be intent to break up the marriage.

The spouse filing the suit must also prove the existence of affection at the time of the affair and a direct cause-and-effect relationship between the other person's actions and the loss of that affection.

You may have that evidence since Grant broke it off after you left your husband.

However, where the evidence exists, people have been known to collect six figure judgments.

If your marriage was already doomed, the lawsuit would not work. If you can show that your marriage was working (even if imperfect) then it might.

Possibly. Generally, prior acts are not admissible to prove that someone engaged in a different act, but there are exceptions. One could argue that this is evidence of his intent. It would be up to a judge whether that would be permissible.

One other potential problem - if Grant does not have assets or money to enforce a judgment against him, it may be hard to get a lawyer to take the case on a contingency basis.

Well, then your next step is to hire a good lawyer. Hopefully someone will be willing to take it on a contingency basis so you don't have to pay hourly, as that can be very difficult to do.