Is its just my boyfriend or all men?

So we got an 12 week puppy we have had him for 2 weeks. he had a bad experience with his ex and dogs, and we have an agreement that I have him when I'm off work he has him when I am at work (he doesn't work) but for the past 2 weeks all he keeps saying is he is a nightmare and keeps bitting but he is not like that when I'm home. And he is leaving the dog with his mam on days I'm at work so he can go out with his mates but I asked him to have him 1 day I was off work and he was selling the dog and everything so I took the dog with me. So what am I ment to do if I try talking to him about its all he says is okay what ever then goes to bed
Is its just my boyfriend or all men?
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