He's in Jail......And I'm falling for someone else!

I have been in a relationship w/ my fiance for the past 2 years. 8 months ago he was arressted and put in jail….he will be serving a 1 1/2-3yr sentence. For the past 8 months….I have been faithful both physically and emotionally. That is until 3 weeks ago. I met a guy who is absolutely fascinating. He really cares for me and my feelings. My mind is now torn as well as my heart. When I go to visit my fiance (James)…I don’t feel anything anymore…to sit there for an hour is pure torture lately b/c all I can think about is Anthony. I feel like I’m finding myself….I’m a better person since James has been gone. But If I leave him….he’ll die in there. Not to mention I moved in with his parents until I can find another apartment. Anthony is a good guy, has a job, and no criminal record. James went w/out a job for 4 months….stressed me out alot….an was sneaky. But I loved him w/ all my heart. Now I’m not feeling anything for him as far as being in love. I love spending time with Anthony…things are going sooooo great….and he makes me smile everyday. We have alot in common. But I’m worried about what my family will think….They love James…an they think that when he comes home everything will be better. What should I do???