I [29F] suspect that my partner [30M] is cheating on me, but I have no hard evidence.

I have been dating my partner for one year and 4 months. I learned that he had cheated on me this past March, and we decided to continue dating.

Fast-forward to almost 5 months later, I am starting to suspect that he is cheating again, but don't have "hard evidence." The worst part is, I am uncertain if this suspicion is due to my hyper-viligence from being cheated on, or just a gut feeling.

Thoughts on how I should proceed with dignity and grace?

TLDR: I [29F] suspect that my partner [30M] is cheating on me, but I have no hard evidence. How do I proceed with dignity and grace?