For the most part, girls don’t find it unattractive if a guy laughs out loud while he is chatting or being social.
That being said, you do have to know what situations and circumstances are best for this laughter.
A guy who makes obnoxious jokes that girls don’t find appealing or funny, laughing out loud at them, isn’t attractive.
There is good laughter from the heart that is loud and infectious, and then there is bad laughter that comes from a guy who is trying too hard to impress the girls.
What is your end game when you laugh out loud on a constant basis?
A girl can be in love with a guy who she is not attracted to physically, depending on whether the guy has become someone she now relies on emotionally.
She sees the guy as her emotional foundation.
When she is dependent on how he supports her emotionally, she can fall in love with that side of him.
This is amid the reality that she isn’t attracted to him physically.
Now, the problem with this situation is that she never gets over the physical impediment.
Women like it when they know a guy is wanted and desired by another girl, as it makes him more of a catch.
If you have observed that more women seem to like you since you got a girlfriend, you are exuding a level of appeal that you weren’t when you were single.
When these women see you with your girlfriend, they begin to compare themselves to your girlfriend.
Women do this often.
They size each other up for beauty, fashion, attitude, friends, etc.
That being said, you do have to know what situations and circumstances are best for this laughter.
Girls get the perception you are trying too hard, or being too eager very intuitively. 
She sees the guy as her emotional foundation. 
If you have observed that 
They initially think the single man is a little different for having cats, assuming the quintessential single man would own a dog instead of a cat.