Why is my ex hiding that he's talking to someone/seeing someone new?

Anonymous
Before you comment "Why do you care? He's your ex! None of your business! Move on!"...

My ex and I coparent our 2 young children together... so if he is dating or seeing someone, I would like to have a heads up for the sake of him not just bringing a random stranger around our kids unless she's a good person. It's not good for our young kids to be exposed to random women around their dad because it could confuse them. Plus, as their mother, I do feel like I have somewhat of a right to know who he brings around our kids.

My ex and I were together for 4 years and he ended the relationship 3 months ago. Since our breakup, he has been extremely private and lowkey about his personal life which is fine... But I noticed his Snapchat score going up by a lot everyday... If you're not familiar, your score only goes up if you send/receive photos or post a story, yet he doesn't post any stories so he is sending/receiving photos from someone all day everyday. I doubt it's his guy friends. I also heard from a mutual friend that he is seeing someone. I finally contacted him today in a friendly manner and asked him if he was dating/talking to someone new and he immediately told me no and denied it. I told him that I would NOT be upset if he is and that I would be happy for him. I only want to know if he plans on bringing her around our kids. He still continued to deny it and say he's not seeing anyone, not talking to anyone, not dating.

Why is he hiding it? I already reassured him it would be fine! It's not like I would go crazy ex on him or her and I told him that! If he started talking to her 1-2 months ago and we ended our 4 year relationship 3 months ago, is she considered a rebound?
Why is my ex hiding that he's talking to someone/seeing someone new?
5 Opinion