Well, for Abeer this is more than just an attraction, and the way Leher kept looking at him, etc...he must have assumed that she felt the same way towards him as he did towards her.
Happy-go-lucky guy, but he too does have feelings. The incident between the 2 families is why Leher doesnt want to get into anything with Abeer, even though she knows that her feelings too for the guy run a little deeper than attraction.Sometimes, there are feelings that are there, but then you dont realize it till u are told in your face that there is no hope....that is what Leher did to abeer....he knew what he felt and she also knew that there is something more than just attraction, but when she told him that all those feelings that were being portrayed in the form of a friendship, had to be supressed/put an end to, thats when the enormity of the situation struck him.
loved your take on the epi sssiham
and yes its just a matter of them realazing it to be love and Leher is right in her own way
coz this relation will only put her family at risk of humiliation at the hands of Boodha or TN
and she definitely wouldn't want that