When is it over?

So help me out here. Tell me if you think I am over reacting. So I have a husband and we have been married 3 years in October and been together 7 years in June. We have a beautiful 5 year old together too. Throughout our relationship he has talked and flirted with other women maybe 6 major times I can think of and each time he gets caught he wants to just delete the messages. This is an issue for me because I have a bad memory of the little details when he talks to the ladies. Basically another incident has happened when I seen he was talking to 2 more random women (through text) and I kind of feel indifferent. I'm not shocked, im not crying, but I am a little hurt. I just don't know what to do anymore... I feel like the fact that it is not bothering me that much speaks volumes as to how I feel. What is your opinion???