I've noticed I had this problem since I was teenager to where I'll be friends with someone for probably over a year or so and I'll just stop talking with them for months! I acknowledge this now and yet I still do it and can't maintain a consistent friendship to save my life, hell you can forget about relationships Lol I just can't get that close to people like I could as a kid and it frustrates me to no end that I do this subconsciously.