Fiancé living at EX now and then

Here is my issue I need some advice on Me and my fiancé is currently living in a long distance relationship and we plan on moving in together as soon as possible somewhere around where he lives right now. When I first got to know him he was still living at his Ex and two kids (she has full custody) but he wanted to get out of there as soon as he could because they two really not get along and wanted to move on with his own life (she had a boyfriend that lives far away, still together) and he couldn't afford a place on his own. I'm not really sure how long they had the relationship ended for but I think for almost a year at that time. He later found someone to live at (a random old lady that had a spare room for him to rent) His problem right now though is that after he lost his job he had to move out from the old lady so he's currently living with friends and family to stay away from sleeping on the streets and his only option ATM is to go back to her place and stay there to have roof over his head and a warm sofa. And to be close to the kids he rarely been seeing because of her. She offered him to stay at hers now and then and wants them to be able to be friends. He told me he really only wanted to stay there as an absolute last option and that it would take a lot of trust from my side. I do trust him he's not close to her at all (I've heard and seen a lot, she's really a pain in his life) but it still feels... awkward for me for him to stay there. He also told me he won't be there during the days when she's there and encourage her to go see her boyfriend or friends, so he can be there alone with the kids. What do you guys think of this? I've told him I just have to be okay with this, because I do NOT want him out on the streets. He can stay at his mothers now and then and maybe a friend a couple of days sometimes as well. Last time I spoke with his EX she told me that she will always love him and wants them to be best friends as she needs a lot of support atm which she don't get from her boyfriend, but as far as I know he's not helping her at all and just stays there for the sake of being indoors. Can I trust that? She is really jealous of him and me being together and have clearly not let him go yet. Isn't this confusing for the kids to see mum and dad "living" together again and the feeling that disgust me is that she is probably really happy to have him around more again.. :scratchhead: Advice!

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