Advice...

Hi ladies. I’ve been with my partner almost 8 Years now, our baby girl is just short of 4 weeks old. I’ve been so happy and in love in our little new born bubble but something today has recently upset me. I love my partner and I can’t wait to be intimate with him again, we’re always so loving with each other and are always kissing and cuddling.. I had an episiotomy at delivery so we can’t have sex until baby is at least 6 weeks old. I walked in on my partner pleasuring himself in the bathroom today. He was turned away from me so i pretended like I didn’t realise what he was doing... This is the longest we’ve gone without sex so I understand him being sexually frustrated but it’s just upset me how he snuck off to do it whilst I was downstairs feeding his daughter. All my thoughts are occupied with her so I don’t understand how his can’t be the same. Do I say anything ? Am I over reacting ? He goes back to work tomorrow and I just feel like it’s tainted our last day off together :(