What causes insecurities in a friendship? Its the unmet expectations that gives rise to this insecurities. Insecurities leads to paranoia which ends up in frustration. This could also lead to destruction of a friendship instead of development/maintenance of a friendship as one would tend to say hurtful and accusatory words to one's friend. Define your expectations and think about it properly. Are they demanding? Is it difficult for your friend to meet that expectation? If yes, moderate that expectation. Let go of these difficult expectations and not let it ruin your friendship just because your friend is unable to meet it.
Never ever accuse your friend for something which he is not feeling. If you are unsure, clarify and don't accuse him or her of feeling this way because you will never know how he feels unless you clarify. To build a friendship, you have to be nice about it and not be harsh because that is not how you should behave. What level do you want to bring your friendship to?
If you know that things are not like that but you cannot seem to stop thinking about the worst then "thought stopping" methods have to come in. There will definitely be happy and enjoyable moments in a friendship. Why do you decide to develop a friendship with a person if you don't like him in the first place? Therefore, distract yourself by giving one loud clap or smacking your leg to stop ruminating about the bad and use that interval of distraction to replace these negative thoughts with the positive. This may help stop you from thinking the unthinkable and maybe even paranoia. Trust your friend for he did not do anything to make you distrust him. Build this friendship and not destroy it.
........................... Chapter closed............................
Book burnt