Im walkin down a 2 way street. should i proceed or turn around?

IVE BEEN WITH MY MAN FOR ALMOST 3 YEARS. WE HAVE BEEN THROUGH UPS AND DOWNS AND EVERYTHING, BUT WE ARE STILL STAYIN STRONG. DURING A TIME WHEN HE WENT AWAY FOR LIKE 2 WEEKS I MET THIS GUY AT A BAR-B-QUE. I MEAN HE IS Y JUST VERY ENTICING. BUT THE ONLY THING IS I FORGOT TO TELL HIM I HAVE A MAN. NOW DURIN THE TIME OF SEEIN HIM. WE HAD RELATIONS() VERY GOOD RELATIONS BUT AT FIRST I DIDNT WANNA GO ANY FURTHER. NOW THE OTHER GUY WANTS ME TO BE HIS GURL WHILE MY MAN IS TRYNA FIGURE OUT WHY OUR LIFE HAS CHANGE AND WHY I ACT DIFFERENT. GUYS I LIKE BOTH OF THEM. EACH ONE HAS THEIR OWN QUALITIES. BUT I CANT KEEP ON DOIN THIS DOUBLE LIFE WHAT SHOULD I DO?