Whom to choose

There is a guy (A) whom i like n he likes me too. We have been talking since quite a long time now and we decided on not getting into a relationship i mean we haven’t given it a title. In the meanwhile, one of my friend(B) proposed me telling that he likes me n he wanted me to know him. So when i told guy A about this friend, he forced me to meet him(guy B)n during this meeting we kissed. Although, I told guy A about this the same day. After another meeting, he started ignoring me n now the problem is that I have started getting feeling for guy B n now he is telling me that he feels that i’ll be unstable in a relationship n that just hurts me more. N guy A is telling me to make a decision. I don’t know what to do in this situation.