How do I (28F) move past my fiance's (30M) infidelity?

Throwaway because I don't want to dox myself<br><br>So a few days ago I found out that my fiance (who I've been with for almost 7 years) had a one night stand with someone while out on a work trip. It's been killing me because we were supposed to get married 3 months from now. I just don't know what to do. I feel like I can't trust him and I don't know if I'm ready to forgive him. I don't know if our relationship will ever be the same. What can I do to move past this? Is there a way that our relationship can be saved?