How do you break up with someone and still remain friends?

Hi there! My boyfriend and I have been dating for about 3 months. He is really clingy. I've talked to him about it, but he doesn't stop. He also is always wanting to touch me, even if I tell him no. It is really annoying. He is very sweet though, and I still want to be friends with him. How do I break up? Also there is this guy who I kind of like as well. He and my boyfriend are like mortal enemies. The other guy and I have been hanging out a lot. Would it be bad if i eventually date him?How do you break up with someone and still remain friends?
just tell him that all these factors make the relationship unable to work out. be honest and blunt about it. give him some time to get over it, and then you can approach him with just a friend vibe. eventually you can date the other guy. there's no restriction on it. however, there is always the possibility you will lose your (to be?) ex as a friend...but...that's life.