Ladies 😪

Long story short, I've been with my s/o for about a year and a half. Just recently found out they cheated on me a second time.. I decided we'd take things slow and all of a sudden this new guy comes around. At first it was innocent hi bye conversations, then it started getting more serious. I never did anything becides text and exchange a few photos.. I do feel wrong, and I do love my s/o but I just feel like something's missing.. What should I do?