Totally in Lust with Another Guy

I have been dating a guy for over a year now and I thought we had an ok relationship until I saw my ex boyfriend again (who I dated for 3 years). I started rethinking my decisions about dating at that point.
Then I began talking innocently to another guy that was there and I am completely in lust with him right now and I don't know what I should do.
I haven't acted upon any of these urges but I don't know how long that will hold out. I don't know whether to give up this current relationship or to suffer through the feelings that I'm getting now. . . . please help.

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