Am I wrong

So me and my boyfriend were out walking and he asked me to send a picture of the ring I wanted...I’m thinking “just look in your messages” but then he says I deleted your messages because you make me mad sometimes! What I’m confused we been in a relationship 4 years we are 27 & 28 like really how old are you! I feel like he deleted my messages because he trying to cover up something...idk

I feel like he is cheating on me. Today I sat outside his job to see if he really gets off at the time he tells me and I seen him get off not at the time he told and turned the opposite way from home. So I texted him and asked is he getting off at 9:30 to see if he would lie but instead he tells me he left early....I hate this feeling... I shouldn’t have to sit outside your job to see if your cheating or lying to me....

Am I wrong??