Do girls have friends with benefits because he won't commit to relationship? Am I the safe option (found out she had friends with benefits?

My girlfriend had a friends with benefits and i feel like i might just be the back up option because he wouldn't commit to a relationship. I noticed girls will have friends with benefits guy hoping he commits. Would you guys recommend move on and find a new relationships. Also maybe she will cheat becase she misses what she did with him? since she was clearly happy to have be with him with no commmitment for a long time.

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I feel I could be a backup option basically
Do girls have friends with benefits because he won't commit to relationship? Am I the safe option (found out she had friends with benefits?
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