Your friends
As I write this, I’m reminded of a common expression:
“Birds of a feather, flock together.”
This means that cheaters will tend to hang around with like-minded people. Likewise, folk who are faithful to their spouses will likely hang around with faithful people.
Your friends should be people that you trust. Take a look around you and ask yourself if there is someone you’ve known for a long time that would make for a great partner.