You might be over thinking, your mother-in -law has recently lost her long-term husband, as the son (your husband) who also has lost his father, if he couldn’t be physically around, getting in touch is the least he could do to comfort the mother and himself.
If at this time, you could show the strength and kindness towards both of them, your husband will acknowledge and
greatly appreciated your efforts. After all, we show sympathy to strangers who lost loved ones, why holding a grudge towards people who are important in our life?
When people are sad and lost, they are in a bad state of mind, plus it seems your husband is exhausted from whatever the business both of you are running, does he even notice what’s going through your mind at this moment?
Take actions, make positive changes, invite him to spend more quality times with you to overcome the current situation, sometimes we have to go down low before bouncing back high again.
Your marriage, you are in charge.
All the best!!!