The one and two month milestone are seemingly the hardest. Some people have trust issues, and getting past the first few months milestone can feel a little like give and take. You share something personal, and then they share something personal. Eventually, you start to get to know each other and build trust in the relationship. While the six month milestone seems to be a good place to stop and assess how things are progressing, it does not have to be an end all. Take all the advice on dating and all the given advice dating can be really easy or really hard. How compatible you are together will dictate the results.
However, it is unlikely that a relationship will get boring around this time
If you are looking to get your boyfriend a gift for your six month milestone anniversary, it may be a good idea to give him something that reminds you both of your first month or so together.