How would you feel if react if the man you are in love with stops being intimate with you, then says if you need to find someone to fuck to fill that need, he dont care?
It all depends on the type of relationship and boundaries you guys have set. For some open relationships are ideal. It must be acknowledged though that the contexts/boundaries of open relationships can vary widely (ie. “We have sex with others but only in front of each other”, “we have sex with others separately”, “we have regular group sex”, “we have other people we go to for emotional/romantic relations”, etc.)
If you speak to someone who is sexually monogamous then they might feel anger, rejection, or insecurity being told that their partner doesn’t care if they have sex with other people.
If you speak to someone who is sexually non-monogamous they may feel encouraged to branch out, learn about sex from others and apply that to their main relationship, or they may adopt one of a variety of non-monogamous relationship styles.
It’s really all up to the person, but if you are not comfortable with the new boundaries your partner is suggesting or demanding, or you cannot see yourself trying them out then it’s likely something has changed. You won’t know until you try to have an open conversation to discuss your current desires and feelings.
The situation could also be what OP^ mentioned. Your partner could be experiencing som mental, physical, or emotional distress that is making him feel inadequate or insecure. Most of the time erectile dysfunction is due in small part to some physical imbalance but is in large part due to some mental or psychological block. Also the appearance of ED can be significant enough to cause prolonged ED due to stress, anxiety, or insecurity about having ED.