If someone was a serial cheater in the past, can they change?

I would like to believe that some people can redeem themselves and become someone better in life. This is what I'm struggling right now.

I've been dating my girlfriend for about 5 months now (we're both 24) and she cheated in the past. She cheated on two bfs in HS, a fiance 3 years old and was even the OW (other woman) once. Though, she claims to have learned from it and doesn't ever want to cheat again.

So far, besides her confessing to all this... I haven't been given any other reason to distrust her. So should I give her a chance? Get suspicious? Dump her?
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If someone was a serial cheater in the past, can they change?
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