Is it possible???

Think my husband has his mistress using my phone number to text her how can I get proof because I can check my phone it will say I have a missed call or text but then when I go read messages they disappear.

*response to first answer: already tried that it only gives numbers that income and sends.Thanks for your response

*response to second answer: I tried what you said but couldn’t download data. Thank You though thanks for your response.