My man or myself?

So me and my fiancé have a 3 month old baby and ever since he’s been born I’ve been so ready to sleep with him. We have sex maybe once a week for 10 SECONDS or long enough for him to cum. Idk what to do, I’ve brought up using a penis ring or special lube or something to get me off but he acts like I’m attacking him and that he isn’t good enough for me but that’s not it at all I just want to cum😭 maybe 1/25 times I will. And he NEVER goes down on me or anything and I’m constantly doing it to him at least twice a week. Idk what to do help a girl out