Why is m boyfriend still on tinder?

I‘ve been with my boyfriend for almost 2 years. Yesterday, my friend told me that he found his profile on tinder yesterday. He didn‘t message her, but he liked her and he was online. I feel so sad, especially since this is not the first time this happens. He also had the app a few months ago, back then he apologized and said he would delete the app. Apparently he never deleted it, or downloaded it again. I‘m so confused because he treats me like a princess in real life and I thought he loves me deeply. Why is he doing this? Would you break up?
Why is m boyfriend still on tinder?
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