My relationship

Before i write this please do not judge my decisions ive made because it is my life not yours.
So ive been dating my bf for a little more than 2 and 1/2 years. Ive been having mixed emotions lately though and its probably because ive been hurt. He cheated on me before but we talked and worked it out. I probably should have just ended it there though because once a cheater always a cheater. In the past couple of months ive found out he has been talking with other girls and hiding it from me. I wanted to end it as soon as i found out but he begged for my forgivness and i gave in. I know he loves me but i honestly cant ake this feeling out being hurt anymore. We have fun times together but they dont make up for all the wrong things he did. You would think that since we have been dating for this long that girls wouldnt be on him all the time but they are. Like hello? Im right here and ive been here for almost 3 years with him could you back off? But hey i cant exactly blame them since everyone knows he cheated so why not do it again? I know when my bf name is brought up in a conversation that people are thinking that im the poor little gf who just cant end it with him becuz im so inlove. It makes me feel weak and kinda desperate but im not that bothered by it. I honestly have no trust left for him and i even told him that. I think trust is a really important quality in a relationship and without it your hopeless. If your calling me an idiot right now for staying with him its because you dont undrstand what we have been through together and i love him and i know he loves me. Im just not sure anymore though and i guess not being sure about it is a sign or something.