This happened to me only??

I don't know. How i lost my friend but i lost them in 10-15 i talk daily and talking about daily and routine life and about hobby and some funny talk to but i don't know how i lost them. They not reply me after 15days just ignore me like i am nothing or stranger for them 😩😩😩😩 feeling so lonely. May be i am not perfect for their friendship... Please guide me how can i make long term friendship