found condoms in my bfs car

My bf lent me his car because mine was at my parents house. I just had a baby 2 weeks ago and we hadn't picked up my car yet. I get in the car and on the door were 2 condoms. I clearly call him yelling and screaming and he says that they aren't his. That he found them in the
Car and assumes it was one of his boys that dropped them. They are the same brand he uses. Magnums. He said that he found them in the car, and put them in the door. He said he knows he should have thrown them away and doesn't know why he didn't. That it looks bad but he didn't cheat. Is this a silly excuse? The whole ohh wasn't me line?