Is my relationship becoming unhealthy?

We have been dating for 18 months and for some reason (stress, college, external issues) I've been noticing that I might be a bit mean to him, lately. I do not like how I am behaving and I need some advice. For example, He will do something little to get on my nerves and I will flip and show my dissatisfaction. However, we talk about it and solve the issue (as always). Is this part of a healthy relationship? Or am I becoming toxic? Or is our relationship ending?😭😓😰 Is this normal?
Is my relationship becoming unhealthy?
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