I am having a hard time imagining how much damage your ex-boyfriend may have suffered when you accidentially hit him in the eye with a french fry.  First, whether or not your are liable depends on how long ago this happened.  All states have a statute of limitations on claims such as this.  Most states allow a person a two year window in which to bring a personal injury claim.  If this french fry mishap occurred past your state's statute of limitations, your ex would not be able to bring a claim.  If you are still within the statute of limitations, technically you could be liable for damages he may have suffered as a result of you throwing the french frry.  Again, this is a stretch.  It sounds more like he is bitter because of the break up.  If you were resistant to paying for any of his medical care, he would be forced to bring a formal lawsuit against you.  Suing someone is expensive and time consuming.  Depending upon what his medical bills really are, it might not be cost effective for him to even bring the lawsuit.   Worst case scenario, if a court found that you were negligent in throwing the french fry and the french fry stiking his eye caused him damage, the court could order that you reimburse him for his damages, which could include medical bills, lost wages and pain and suffering.