At first glance I was like why is anyone even asking this question. But the corrected version I would have to say no, not a deal breaker. It would depend on the nature of their relationship. Were they in love or was it a one night stand? Was it just a sex thing or do they still creep from time to time? It also depends on what he wants from you? Are you going into a monogamous relationship or is he just trying to get down for the sake of saying he slept with two friends? Does your friend still have feelings for this person? I would discuss with the friend first and definitely wouldn't rush into having sex with the person. It may be less complicated to get someone who hasn't smashed the homies but if you really like them it could work.
Just remember, it's never what you do but how you do it. Good luck!
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