Husband feels alone

We have a 6 month old baby. Husband says he feels alone. He says he misses our relationship before our son. Basically feels like he’s always on the back burner with me because I am taking care of the baby 24/7.

What do I do?

Also the last 2 times we had intercourse he had problems. The first time he couldn’t get an erection and the second time it took forever for him to come. I’m talking there was sweat dripping off him and falling on to me. I think he’s resenting me