My boyfriend always asks to split the bill with me when we eat out. He doesn't offer to treat me except our first date. Is that a bad sign?

Aside from this he invited me on a trip to another country to meet his parents. He let me pay for my own plane ticket. Is he not investing much into the relationship?
My boyfriend always asks to split the bill with me when we eat out. He doesn't offer to treat me except our first date. Is that a bad sign?
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