masturbate hourly for 7 days
Get rid of him, once a cheat always a cheat. Don't wait until he gives you a STD.
You don't MUST do everything. If you have a kind heart and you really care about him, forgive him. ONCE. A mistake you can forgive. If he does it again, back he goes to the used boyfriend store.
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Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them