Cheating ...?

So, me and my boyfriend have been fighting lately I just gave birth 5 weeks ago and I can already I’m have ppd symptoms since I had it with my first daughter as well and I’m so emotional/sensitive and being so rude to me about me being sensitive etc. I looked at his Apple Watch tonight and I saw this this text message was deleted from his phone but not his Apple Watch does this mean he’s cheating on me...