your boyfriend was always unfaithful. He always looked at other women/men, and only gave you affection in public.

one night, after he was down gaming for three hours straight, he asked you if you wanted to be in an “open relationship”(A relationship in which both partners agree that each may have sexual relations with others). After a while, you finally agreed. He started coming over with more women/men everyday, showing more attention and affection to them than he ever did to you.