Need some advice please

Alexis • 24. Wife. Dog mom. Cat mom. TTC through ivf. Finally pregnant with my 🌈

I have been with my husband for 5 years. We will be married for 3 years in October. Lately we haven’t been on the same page do to me being hormonal from <a href="https://glowing.com/glow-fertility-program">IVF</a> drugs. And let me just say this. He is the most nicest guy you’ll ever meet. He has the kindest heart. You’d honestly think he’d be the last person to ever cheat and you don’t want to cheat on him because he has such a big heart and you don’t want to break his.... Anyways something told me to go through his Snapchat and I found this girl/lady whatever you want to call her. And he has been messaging her and sending her snaps and I never get to see what she sends him because I don’t get to see his phone until he’s back from work. But what really struck a nerve was what this message said. Idk what to do!!. I want to confront him but I don’t want to know the reason. Or I really want to just block her so they can’t message each other. I’ve been putting this on the back burner but it’s getting worse. I used to be able to have his phone all the time. Now he will wake up from his sleep and tell me to give the phone back. I do love him. I feel like sending him a link for a couple therapy. How should I approach this whole subject?.