Avoidant (woman) + avoidant (man) = one of them cheats.
Anxious (woman) + anxious (man) = frequent fights.
Secure (woman) + avoidant (man) = the woman becomes anxious to the point of stress.
Anxious (woman) + avoidant (man) = Breakup → regret → get back together → stay together for a short while → break up again.
Being discarded by an avoidant has to be by far one of the most traumatizing things to me. Because what do you mean you woke up one day and decided to never talk to me again?