Originally Posted by opalescent
If being in a secondary relationship makes you feel shitty, unloveable, and generally not as good, don't enter into a secondary relationship. (Kind of the reverse of CielduMatin's advice.) You're not doing yourself any favors nor are you doing a solid to potential secondary partners.
Yes, absolutely - totally agree.
Only do it if it's a net gain for you. Otherwise it's totally not worth it.