Roommate will not leave!

My SO and I have been together for 3 years. He rents a house that he wants to buy. Before he and I started dating he moved in and asked his current roommate to move in to split expenses. We started dating a year after they moved in. I would stay over occasionally and it wasn’t an issue. Fast forward a year and we have a baby in January 2018. I had an apt and we would go back and forth between my place and my SO with our daughter. This eventually became a hassle with work schedules and lugging all the baby stuff back a forth. In August 2018 I told my apt I was moving out on November 1st. My SO other had a discussion with the roommate and told him he didn’t have to pay rent for 3 months (so he could save for a new place) and he agreed to move out by November 1st. He even said he figured we needed the space with the baby and my SO also has a 10yo son that stays with us every other weekend. The roommate lost his job and started another one within a week but he had a pause in paychecks so we agreed to December 1st instead. Still no rent being paid. He told us he would start packing and he was looking at places. He has the master bedroom, bathroom, and the whole basement which includes a kitchen to himself. My SO didn’t mind having the smaller room when he was single. However we now both sleep in the small room and my baby also sleeps in her crib in our room. His son has the other bedroom. We are very organized and I hate clutter and like a clean house. The upstairs living room and kitchen is our area and stays clean. Let’s just say the roommate is the opposite. He is a hoarder! He doesn’t clean, he spends all day watching tv in his room. He hasn’t packed a single think and just keeps ordering more stuff and bringing it into his area of the house. We need to rearrange bedrooms and do some major work to the house but his stuff is in the way of that. He will not clean it up! Thankfully we can’t see it because we stay out of the basement. I am now almost 12 weeks pregnant and really need to start getting stuff ready but again he isn’t leaving. It is going on 7 months of him not paying rent and just giving us 100 dollars here and there. Which wouldn’t even cover his share. My SO has talked to him a few times but it just doesn’t register with him. I left a letter taped to his door the other day to avoid confrontation and it seems like he now just hides in his room even more! We don’t want to evict him because that would make it harder to find a place but at this point we don’t really have much of a choice! The landlord is also close friends with my SO and has no issue evicting him. The landlord doesn’t like the mess he has made but left it up to my SO. I don’t get why a single man with no kids, in his 50’s would want to live with a family that obviously doesn’t want you there. The stress of it all is starting to make it hard for me to sleep and giving me headaches. It also is causing a strain on my relationship. I want to get my daughter used to sleeping in her own room but I can’t do that until he leaves. I really didn’t think it would be almost 7 months! He also parks in the driveway and makes me park on the street even though I have a child to carry in on my days off and I work until 3am! I’m just over this whole situation. Sorry for the long post but I needed to vent. 🙄😡🙄