When we were first dating, I found out he was friends with a girl he was trying to get with before me. Long story short, he did some shady shit and it brought up me wanting to see when he last contacted her to hang out because i would be kinda upset if he was hanging out with her. Of course, messages were suddenly "missing". he later admits he deleted them without good reason. it's been a few months since then and we went through an issue that caused me to mistrust him (he lied to my face several times before I found out the truth about him using certain drugs). somehow, the girl got brought up recently and I thought about his lying recently and I questioned him about the deleted messages and he got really anxious when I questioned him but claimed he was worried about upsetting me but gets super defensive to the point he's pissed at me for asking. idk, I'm suspicious. how would you approach this? am i overthinking?