Boyfriend in jail?

My boyfriend has been in prison for 9 months now, and it will be a year-and-a-half before he gets out. He is assuming I'm being faithful. But a friend that I've known forever came back into my life, and we have been going out for the past 8 months. I think I'm really falling for this guy. I'm not sure what to do about my boyfriend in prison we were only together 8 months before he left to prison. But I have had a crush on this guy for 10 years and I don't know what I should do?
Boyfriend in jail?
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