this is HOW I KNEW my s.o. was the ONE: and did this in order when i was following my heart... and NOT SEE any RED FLAGS!
1. COMMUNICATION - that's how we "hit right off of the bat!"
- and also we always communicate our feelings instead of blowing things out of proportion or off steam let alone getting silent treatment...
2. TRUST - he always told me what was happening EVERY MINUTE- i am not kidding! unlike most men especially with LD- he even told me he was going to the john! 
3. HONESTY- he never drools or looks at other women- and that's when I KNEW!
.... and also we were always open and honest with each other right from the start and we still are! 
4. COMPROMISE- we always have a balance.. there is no way people can be 100 percent compatible... we are about 90%... i will give you a perfect example: i love watching grey's anatomy and supernanny... he will watch it with me
he loves all CSIs shows... i will watch them with him... the list goes on! 
5. SEX- of course it is all part of the WHOLE PACKAGE!

TOTAL: LOVE!!! 