Well, this happens on the beginigs...I was with my ex for like 7 months but I just left him cuz I stopped loving him...
What should you do? My question is: Do you still love him? If the answer is no then it's all clear...you should just leave him...Only that way you'll be happy again...(I assume you're not these days...)...But, if this is all only about liking another guy and still loving your bf...get over it! BUT! You're still so young...