My bf always tells me Yeah we'll go do something tomorrow and then he just goes out by himself and…

My bf always tells me Yeah we'll go do something tomorrow and then he just goes out by himself and says we'll go do something later when I get back, but by the time he gets back he's like I'm tired can we just stay here.. like I get he wants to go chill while he can before the baby but I wana get out and do stuff too.. just not fair I have to sit in the house all day doing nothing. Idc about him going out but when he tells me were gona do something, don't just change up.