There was no clear answer to this question because the word "sick" might have different meanings and usages in different context. In some cases, having a sickly girlfriend may be considered a good thing because this trait usually makes the girlfriend feel deeply loved and valued. Sick girlfriends may show some special behaviors such as excessive dependence and possessiveness, which may make their boyfriends feel satisfied and happy. In other situations, however, having a sickly girlfriend may be considered a bad thing because this trait may cause the boyfriend to feel stressed and uneasy. A sickly girlfriend might show excessive possessiveness and control, making her boyfriend feel suffocated and depressed. If the boyfriend was not strong enough and confident enough, he might feel that he could not cope with this emotional pressure and lead to the breakdown of the relationship. Therefore, whether having a sickly girlfriend was a good thing or a bad thing depended on the specific situation and the feelings of the boyfriend. It is recommended to communicate openly and honestly with your girlfriend to understand each other's needs and expectations to ensure a harmonious and healthy relationship.