Maybe he wants to trap you. It does happen.Which of the two of you doesn't want to make the relationship exclusive? If it's you that doesn't want to commit then my answer is very possible.
Another reason he does that is because let's face it, it feels better. Maybe he just doesn't care about the consequences. Is he aware that you're not the pill?
If this is an issue for you, then you need to stop letting him do it.
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