<human>: I found out from a mutual friend she cheated on her previous bf about a month after she turned 18. They were dating for a month and a half. He went off the radar for 3 weeks and kept bailing on her (drug use) so she cheated on him with another man. 

I have no reason to suspect she has cheated on me, however I have an anxiety and keep hearing "once a cheater always a cheater". I can't seem to shake this and have been developing trust issues due to this. I guess I'm just looking for advice or reassurance. What would you guys do?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: GF had a shitty previous short relationship with a commitment phobic drug addict (she was unaware) and cheated on him. Need advice on my developed trust issues due to this knowledge.