He starts to swear around me only when we are alone. What does this mean?

Anonymous

For context;

He developed strong crush on me, then I also (unknown to him), developed feelings for him. We spent weeks together at night chatting and talking non-stop. We kissed passionately, fiercely for 2 nights, and the week after that, he told me that he isn't ready for serious relationship (after I told him that I had feelings for him), and he pretty much friendzones me. And he mostly ignores me, only look at me shyly. When he was with me, he sweared when he saw a Whatsapp notification of a male friend of mine trying to flirt with me, in which I never responded to his (my male friend)'s message.

Well, after he friendzones me, there was this one person who made me upset (but it wasn't a huge issue at all, just that there was this optional class and he didn't want to attend, and I was responsible to call people to the class), and then I walked past by him , and we were alone in the hallway, and he stuttered a bit and accidentally said "fuck you" to me, but then he corrected twice saying "fuck him". And I just giggled , and nodded because I thought it was a silly thing to curse at, especially for a minor issue.

Then some next day, we were again alone in the kitchen, and he cursed again because the trash was full. It was understandable, but I am not sure if he was actually cursing directly at me, or other people who didn't do the kitchen duty because it was just me and him. But I was shocked because he's being more open to me with swearing since the day I giggled when he said "fuck him" to the guy that for him, irritated me.

But the thing is, whenever we walked past each other, we would make a brief eye contact, and he just look at the ground, and smile shyly. And he would stare at me from distant when he thinks I am not looking. So one day I was wearing glasses to make sure where he was looking at in the distant, and yup, he was staring at me while smiling by himself.

He starts to swear around me only when we are alone. What does this mean?
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