There is nothing wrong with marking your territory, but everything calls for a bit of understanding, especially if the person hasn't given you any reason to doubt him. If he has given you reasons to doubt him in time past, then it is understanding that he needs to build the trust, but when he hasn't, its totally wrong to keep holding on to past experiences to judge the present, and the person in question too need to apply a little bit of caution. Everything takes time. Mindset is one of the hardest thing to change. It takes deeper conviction and time.