Not very helpful guys!!
If you want to see other people before settling down, then you should end the relationship with your boyfriend whether you have feelings for someone else or not, after all, if you are not ready to settle, you will have to at some point wont you?
As for your old friend, sometimes a "comfort" factor can feel like stronger feelings, a sort of familiarity that goes with chatting to someone you were once close to. That said, if you really think you have feelings for him then tell him and see if he feels the same, but don't string your boyfriend along in the meantime, he deserves better.