I think in the beginning he looked more like a kid who occasionally throw tantrums over chai patti and someone who is bullied by the Bully of the neighbourhood Paras.
On top of it he has not many achievements to his credit neither was he as famous as Shukla or Paras.
These two were probably the reasons why girls didn't feel attracted to him and also there is no point in making connections with a guy who according to them didn't seem like a BB material.Nobody expected him to last longer than 2-3 weeks.
Almost all the girls are now saying that they ahve seen a lot of growth in Asim over the span of 3/4 months and he is lot of different from what he was when he entered the show.
Sana was saying why he wasn't like this when he entered the show then she would have made him her boy friend
Bagga was shown saying she would like to go on a date with him etc
Zariwala in the show was shown saying that Asim is a gentleman.
None of the BB girls saw potential in him when he entered so they didn't make any moves. They obviously now has changed their opinion about him.
Mahira now regrets bhaizoning him.
Even we as audience didn't see much potential when he entered the show.At least I jthought he was just a pretty face an eye candy for female audience.He proved everyone wrong by showing that he is not just a pretty face in this show.