Uncertain

Hi, I'm not really sure how to start. I gave birth 1.5 months ago. During my pregnancy, I was already very insecure about my looks. My husband started working at a different location around that time (I do visit him at work sometimes). There's a really attractive woman there, about my age (23), but still with a nice, slim figure. During my pregnancy, my husband was already constantly looking at her, and now it's even worse. When I talk to him and she walks by, he stares at her with his mouth open until she's out of sight. And then he keeps looking in that direction until she comes back, and when she does, he always has to say something to her or make a joke. He has no idea what I said to him at that moment. Sometimes he has time during work to come home, but often he stays at work. I'm not sure how to feel about this, or am I just thinking this way because I'm insecure about myself right now? What do you guys think? I also can't have sex yet, it still hurts a lot. I'm trying really hard to force it because I'm afraid my husband will leave me otherwise. But it only makes it more painful. I'm not sure what to do anymore. Greetings.