I dont think my guinea pigs get along? ?

Both of my Guinea pigs are relatively new, we got Steve about 3-4 weeks ago and he's really fat and lazy, just sits around but likes to be held, but we got a new Guinea pig for him to have a friend. He's a lot smaller than him and Steve pushes him around sometimes and most of the time wont let him in his igloo so the new one just sleeps under the hay wheel all the time. Most of the time they seem to be ok but Steve is always in his house and the other one is always outside they don't really seem to be communicating? Is everything ok? Also, is it bad that the new Guy is sleeping outside, not in a house/ igloo? By the way they are both guys