I have NC for this.
I have been observing some very odd behaviour in my partner.
Been together 10 years with 1 Dd.
We own a house together, he earns all the money and I have 2 very low paid jobs. A bit of background.
He's being cagey with his phone, not showing much interest in sex, goes out to his mates about 4/5 nights a week til late, sometimes after I've gone to bed (I go 2 hours earlier than him), his reasons are he can smoke at his mates house.
If he smokes out the back I have spied on him and it looks like he's msging someone and looks around over his shoulder.
He has spent ages on his phone in the bathroom.
I don't know his password so can't look.
He gave his old phone to our daughter to play games on, he left his contacts on there. There are 2 numbers on there that make me feel a bit 
One named Aaaaaaaaa and the other named Football. No names attached.
All his football contacts are listed separately so pretty sure it's not a football friend.
He doesn't play football.
What can I do with these numbers? How can I find out if they are female and how can I get names?
This is all the potential evidence I have to go by. Any ideas?