Well, to answer the first question - are you being paranoid? In my opinion, no. Frankly, and sorry to say this, I think it sounds like she's either already cheating or will be cheating.
To be perfectly honest, in my opinion based on what you said, you probably got married to early in the first place. Statistically speaking, odds for divorce in marriages before, I think, around 24 are much greater than for after. Interpret that however you will.
Should you stay together? It's hard to say at this point. For one, I firmly believe that a decision like that should not be made without first at least going through marriage counseling - which I would HIGHLY recommend you do.
You need to open the channels of communication again, lay all the cards on the table, and figure out what you two will do AFTER a more clear understanding of each other's feelings is reached. Marriage counseling should do a lot to accomplish this.
Are there children involved in this marriage?
Oh yeah, by the way, don't forget to 1) remember this IS an internet forum, so nothing you'll get here beats seeking professional help from someone like a marriage counselor and 2) I'm a 20 year old college student, so what the hell do I know?
