if a boy starts having feelings for you, well do you have feelings for him, it all depends
maybe he's shy and wait that you do the first step.. So when you have the courage you can ask him...
She may still harbor feelings for her, and obviously feels guilt for having contact with her while being in a relationship with you.
In my opinion, having a conversation. In high school, talking more than the casual hello and how are you may lead to growing thoughts of others that say that you are getting friendly, but it all depends on the two people that are doing the talking.
Perhaps you are talking about inability and not ability. Such claims are made to fraudulently obtain disability payments or to avoid having to work. But there are also people who falsely claim to have an ability; such people can be described as boastful, conceited, or in some cases delusional.
Having feelings is a good thing:)
Nicely explain to her/him the problems your having. And make sure when your talking to her say "I feel this way" NOT "You are doing this".
It means that you are happy and affectionate ( well they are a couple of the feelings)
Feelings can often be complicated. Having feelings for another person isn't necessarily bad, however, acting on those feelings while still with your boyfriend would be considered wrong.
Spend less time talking/hanging out with their boyfriend, and eventually your feelings for him will diminish. You're not a bad person for having feelings, but you would be a bad person for acting on them even though you know he's taken.
anger
I assume that you mean "How do you stop having feelings for a girl?" I can't answer that as I am not a lesbian, but I can tell you that if you have real feelings for someone then its not easy to stop having feelings for them... You need to try and remove that person from you life as much as possible. You need to move on.
People's feelings can change. Either you are having your last romance or there will be another one after this one.