Partner asked to do the deed with others - will i give consent?

I have a very low libido these days and my partner is already complaining. I understand he has a need but I just can't. May babaeng nagpaparamdam sa kanya and directly asking him to have sx. My partner is asking my consent if he can. Mataas ang sx drive nya and for a few mos na sya nagtitiis na wala. Dapat ko ba sya pagbigyan to do it sa iba?