Would you consider a man "weak" if he forgave his girlfriend/wife for sleeping with another guy?

if they are in a Polyamorous relationship then no, if we are talking being unfaithful, i think he is Nieve, as if it happens once then it will happen again... like i knew with my ex i got her from her being unfaithful with me, and so when she fucked her ex i wasnt surprised, i wanted to forgive her as she claimed to be drunk, but i also accepted that it was very probably over.