Is this normal?

So I’ve been gone for 2 weeks out of town and just got back today. I’m staying with my boyfriend tonight we were gonna make this

a special night together but this night went down hill real quick . He keeps condoms under his mattress . Anyways earlier I asked him if he still had the 2 condoms and he said yes. Well we were getting all into it in bed and as soon as he was getting ready to get a condom I noticed he had one left wtf... so I questioned him about it and he’s claiming he used one of the condoms to jack his self off.. yeah that doesn’t sound fishy. First he lied to me second that sounds like bull shit. Now I’m here all pissed at him not knowing what to think.. Help please ? Is this normal?