Welcome to EmpowHer! Thank you for your question. I am sorry to hear of your diagnosis. Fortunately, Trichomoniasis is one of the most common STD’s and is easily curable. Nonsexual infection is very rare. Many men infected with Trichomoniasis are asymptomatic. But, up to half of all women exhibit symptoms within 6 months. If you were having unprotected sex with your unfaithful ex just before you began your new relationship, it is possible you were infected by your ex. What is most important is getting the treatment you need and making sure that your boyfriend remains negative. Since treatment is inexpensive and brief (often just a 1 day course of antibiotics), it would be wise for your boyfriend to receive treatment too. Better to be safe than sorry.
Our best to you, and please follow up to let us know how you are doing.