Most Helpful Girl
It's only been two months. Most people figure out if they want to stay with someone 1-4 months in. It would be perfectly acceptable for you to tell her that you have enjoyed getting to know her but that you don't see it going anywhere serious and you want to continue to see other people. This guy below sounds like a really loyal person, that's great, I am too. However, 2 months in I'm just barely getting to know you, I don't have a lot of time and emotions invested in you yet so if I start to see things I don't like, yea, I'm going to end it. However, I've been with my guy for over 3 years now, I've pretty much decided I'm going to stick by his side through good and bad. So now, if I were to come across another guy that I 'might like better', and left my fiance for him, that would just be plain wrong. He's a good man, good to me and deserves my faithfulness and loyalty.
Most Helpful Guy
You can't bud. Your will be a MANDO dick basket if you do it. Leaving one girl for another isn't right. You should only leave if you have problems with personalities or habits you cannot handle or something else but never just cuz there's another hottie running around. You will see 100 of those per day. You have to decide to either commit to your current gf or don't be 'exclusive' with her until you are ready to commit to her. That way you leave options open without being an asshole. Sorry but that's how I see it, you asked.