Quite the opposite, from my own experience, having only your partner as a companion is disasterous. Any partner who insists you should drop friends outside the relationship is a wrong'un.
No. Make sure you have good one's by your side.
Not at all
Is his problem that you have friends at all, that he thinks you spend too much time with them, or that he thinks there's something going on with one of them?
If it's the first one, I'd be worried, that seems like really controlling behaviour. Everyone has the right to have friends outside a relationship.
If it's either of the others, it's something to sort out between you. Is he being unjustifiably jealous, or does he have a point?
i think it depends on how much trust u have for one another. if u cant trust urself then dont bother
no.. just know your limits