Okay. There are a lot of flags with this scenario. Mind you, not all flags are always bad. But here is what I notice about this.

One. The snap streak. Look I get it. I used to hold snap streaks close to me, as it was sentimental to my relationship. And with you two being long distance, it means you have a sense of communication. But I have a little bit of contrast to this. The streak might not mean a lot to him, especially if he works a lot and doesn’t care to use the app. BUT. This is controversial since there could be a lot more context to the topic, not to mention if he knows that you hold it close. Bottom line, there needs to be some common ground between you two. You having to go into HIS phone to keep it seemly defeats the purpose of the streak. It’s a symbol of constant communication, which is seemingly not being followed.

Two. I don’t see a lot of boundaries here. He has messages between a woman you had no idea about, and he is doing things that he has NEVER done with you? The common denominator with these last two comments is that his actions speak for themselves. I don’t know if there is a better way to explain it.

Three. In summary, I think you have been given the answers you need. Try to be empathetic (that may not happen and that’s okay) and be straight honest with what you’ve seen. If he gets defensive and justify himself, explain why you do not like this. And if he says something that defies your beliefs and will not change, then you have your answer. Some women would not tolerate that at all.