It's really hard to not have negative feelings about friends who don't put any effort into nourishing our relationship.
One thing I would ask is "why are you still hanging with those {friends}?" A relationship needs to be nurtured by both parties, it is a dynamic fluctuation between two people. I would ask you to question why you continue to remain together as friends, I always believed that a relationship should emit positivity towards all parties involved, if your in a relationship that is one-sided, it is inevitable that it will start to de-compensate. Never travel with the circus, never travel with fools, everything in life should have some positive payout, will things at times be negative, of course they will, but in order to keep something or someone in your life there should be more positivity than negativity.Hope this helps, C