Thanks for the additional detail. I hope I can help you here...please understand though that online no one can state anything with absolute 100% certainty, all I can do is offer my best guess based on what you've written.
Molluscum can recur (though the literature quibbles on this; some say it is eliminated when it is healed, others do not), though a recurrence after so long is unusual. And, though it can be acquired sexually, molluscum also is commonly gotten by non sexual means. Children get molluscum, often, as its a virus thats commonly found and commonly passed around on various objects like towels.
So, your molluscom does not mean that your partner has been unfaithful. You may have gotten it through any of a wide array of innocuous means.
Here is information on molluscum from the CDC: http://www.cdc.gov/ncidod/dvrd/molluscum/faq/everyone.htm
I hope I was able to help you,
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