Boyfriend secretly texting his Ex

So I recently was just being nosy and started looking at my phone records and noticed that my boyfriend has been texting this one particular number every single day up until midnight. He's not on his phone when he's around me so was usually at times when he's at work or when I'm already asleep I put the number on Facebook to see if it would show me who it was and it did it was his EX I don't know how I feel about this makes me so angry 😡 all I wanna do is confront him but I can because I'm going to just look overly jelouse and he was going to kno I was snooping it does hurt that he talks to her every day . How would you feel if you found out? 😔