This person might continue to struggle with whatever they're dealing with for a long time. People who are already in established relationships can support each other with difficult life circumstances, but I think it's more difficult to start a new relationship with someone who's going through something difficult. Even if they're willing to date you while they work through their issues, they may not be willing or able to make the relationship much of a priority. They may be distracted by their problems and not give you their full attention. I recommend trying to find someone who's in a more stable place.