Follow my heart or mind?

My heart tells me to be with him he makes me laugh smile... Forget about everything.. All my problem... Are connection is strong...but my mind tells me to let go... He did play me 3 to many times... Still talks to other girls and flirts but he says he doesn't talk to them like he does to me... I can't trust him to be with me and only me.... He made me his second choice then finally realized I should have been first. I am head over heels for this kid but maybe love is just blinding me....no matter we will always be friends we both agree.. But he also says that he will always love me weather I want to drop what we have ot not. I can't stop talking to him... I have tried... I just don't know what's best? Help?