Did i do wrong for telling him the truth?

Ok so my mum has this friend who sleeps over and eats here too now and again it's like he lives here.Im all confused because my mum say's they go out and when he's not here she's like oh she don't go out with him he's not her type.She says that he helps her with the rent and stuff even with my christmas presents last year.He's a really nice guy and funny.Ive obviously always wanted my mum to be happy but i never really liked my mum having a boyfriend because im so use to it being me and my mum living in the house and me being the only child :).But anyway my mum went on a date with this guy and she told me not to tell her friend.So when she went i had came downstairs watching tv and i was laughing and talking about what game i want and he said he's got my game card still saved and everything.And i felt all down and guilty and i just had to tell him for all hes done and everything i just don't think its fair.But i told him not to say tell i said it or i'll get batted and he said he wont and that its good i told him and that i don't need to worry because its not my fault.So next day which is today i heard my mum talk on the phone to her girl mates talking about the horrible texts that she got of him saying "was your date ok" or something like that.Now im panicking what if he does tell i'll get really batted im so nervous especially i was excited because my friends sleeping over 2morrow now im thinking twice if i should let her.