Relationship or Friendship theory!!!

From my few experience, there are a conclusion I make in the relationship progress. I name it relationship theory. my hypothesis is whatever relationship whether friendship ,couple relationship...etc, it have it maximum point .it like normal curve when it reach max it will fall to lower point. When a relationship go to it higher point which that she/he is the first person remember when something happen o got some activity or both of the person spend most of time together and getting closer to the stage that you didn’t have a protection shield that u can tell her /him ur secret….then this is call critical point or maximum point. In this point ,you should be very careful that it might fall to very low point suddenly …that is argument or disagreement between two ppl. I had watch or face it on my own this kind of phenomenol. And it really make me feel worry when i m getting closer to someone. then i will make a reminder to go far a bite so to prevent such fall. It sort of trouble me how to maintain the relationship keep floating at the top. This is the question that I trying to find answer and eager to find solution. this is because i have this problem with me now.