Snapchat points and best friends?

[KAVe]

So my boyfriends ex has been #1 on his best friends list. I told him that it bugged me, and he said he stopped chatting her. Low and behold, I was #1 on his list a few days later, and she was completely off. However, I checked again only a day later, and she is back to #1 - my boyfriend swears he only sent her 1 or 2 pics that day while he was at a concert, which he also sent to others. I find it odd that in a 24 hour span, she goes from completely off his list to #1, without hitting #2 or #3 on the way up. Do points have something to do with best friends? She does have more points than me. I don't know. I just dont want this to cause any more stress in our relationship.