Help...?

Well my husband works a lot and isnt that often at home anymore and what annoys me is that he has to work with a partner which turned out to be his ex and I mean I know theyre just working but it's still annoying like people always ask him or her if theyre together and she always takes selfies with him and all and posts them online- our baby is 5 weeks old now and when I first held her I felt like I'm not doing the right thing with him. I'm staying at my best friends place now ever since our daughter was born and I know it hurts my husband and all but I honestly cannot change the situation I just feel like I can't do it with him he comes to see her everyday and says its unfair of me but I just cant do it with him I love him to death and I know he loves me too but somehow his work irritates me I cant really tell you what he does exactly but I just dont want to see his fucking ex girlfriend taking pictures with him/of him in my house. I dont know if I'm overreacting everything is just so hard for me right now my grandmother and cousin passed away during my pregnancy and I feel like all of this is too much for me right now I want my daugher to be in a safe place but am I doing it right? 
I love him so much I really dont wanna leave him just like that but I cant do it with him like that and I dont want him to leave his job either because its his dream and he's been working for it ever since we were children.
I've posted this on another group too because I really need help I dont know what to do anymore... :(((( 
Oh and I did talk to her about it but the picture thing is like a part of their job I dont know how to describe it but they just need to be online and promote each other/their job like that