Well, people can change, but infidelity is not an easy pattern to change, and there definitely is a high probability of repeat behaviors. You best chances are to have a very frank discussion in which you both explcitly agree to the terms of your relationship, including sexaul acts with other partners. Also make as clear as possible what the response will be if this agreement is not honoreb by one of you.
Once that agreement and understanding is in place, stop worrying about it, stop asking about it, stop badgering your parnter about it unless you have specific reason to, not just neurotic fear and suspicion.
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