Ben Affleck can find wife Jennifer Garner's kindness ''aggravating''.

The 40-year-old actor - who has children Violet, six, Seraphina, three, and seven-month-old Samuel with the actress - admires the way his spouse never bears ill will towards anyone, but admits it can be frustrating when she finds his irritations ''petty and small''.

He said: ''Jennifer truly is kind. She means no one any harm. She doesn't have ill will for any person. She's not competitive with other people. She's not spiteful. It's one of those things where it becomes almost aggravating at times. Every time I go, 'F**k him!' I see in her face that she just thinks that's petty and small.''

Before marrying the former 'Alias' star, Ben was engaged to Jennifer Lopez until 2004.

Though their relationship never worked out, the pair have remained friends and the 'Argo' star is delighted his former lover is still doing well.

He told the Hollywood Reporter: ''We don't have the kind of relationship where she relies on me for advice, but we do have the kind of relationship where there'll be an e-mail saying, 'Oh, your movie looks great.' I remember when she got 'American Idol'. I said: 'This was really smart. Good luck.' I touch base. I respect her. I like her. She's put up with some stuff that was unfair in her life, and I'm really pleased to see her successful.''

These days, the 'Argo' star is constantly busy with work and finds it hard to relax and switch off as his children take up so much more of his free time.

He admitted: ''There are so many decisions to be made, and it's more than you can get to each day. There is this underlying anxiety not just about getting the movie done but getting it done really well. It keeps my head spinning -- even when I am giving the kids a bath. I can be giving them a bath or feeding them, and sometimes they say, 'Dad, pay attention!'

''Kids eat up that kind of hobby time. I used to ride motorcycles. I used to play basketball. And now basically I'm at home with them, or I work.''