P
puzzleannie
Guest
OP states she is discerning whether or not it is time to become engaged and therefore start planning to marry this person. She describes finding out that he keeps secret an ongoing, not one-time activity, she finds deplorable. She is asking whether to continue the relationship, so our answers should speak to that situation. If it is a deal-breaker for her, she should break it off now. The behavior will not change, nor will the secrecy surrounding it, without a major effort on his part, and she does not describe any willingness on his part to change.