Friendships and relationships don’t always mix.
In an ideal world, we should be able to appreciate and get along with the friends that our partner has. Many would argue that if it is serious enough that you want to merge your lives together, it is pretty important that you can accept each other’s social circles. If we are all the average of the five people closest to us, some of these friends could say a lot about the kind of individual your partner is.
However, the reality is that sometimes you just won’t get on with your partner’s friends. Perhaps they have acted in a way that you don’t like, or they decided that they didn’t like you first. Either way, depending on the closeness of the friendship, this can become a real point of contention in a romantic relationship. Some people will feel that if you don’t want to be around their friends, you may not want to be around them, either.
On top of that, animosity between friends and partners can make a joint social life quite complicated. It is more difficult to spend time together in a group if there is somebody in that group with whom you have an issue.