Struggling with obssessions and relationships

Hi

Since getting my initial assesment for AS. I have had alot of time think and an aspect of  my life that I really struggle with is obssessions.  When I meet a person who I really like and find we have alot common with each other.  I become very over eager and message them a lot  and end up scaring them away.   This has happen on several occassion in my life when I have try to form a relationship with someone.  I really need some advice as this is really been making me feel really down.