Boyfriend and other girls

how comfortable are you guys with your boyfriends texting/snapchatting other girls? I'm really uneasy about it, but I don't know if I'm overreacting or not. he cheated on me multiple times a while ago, and I don't know if I'm so insecure because of that or if most girls don't feel comfortable with this? he talks to at least 10 different girls per day, not including myself. he seems to be always trying to hide it, but I want someone who doesn't have a bias opinion to give me some advice! any help would be great!