worried about my little one… sorry about the length of this

So my lo is 1 year and 3 months old i weaned him in February and since then he has slept separately from me. he’s always been clingy and shy especially when people are around but now he has gotten soooo irritable around people. he will play but as long as no one is touching him or looking at him. I wasn’t worried before cause he’s always been shy and clings to me but his cousins whom he loves having around and playing with were here today and he wanted nothing to do with them, he just kept playing alone and avoiding them like they are a plague. he did this last week too at my sister’s and she told me not to worry cause he’s probably teething. His clinginess is also worrisome cause he’s literally obsessed with me he always sits on my lap or puts his arm around me he basically just always wants to be close to me and no one else. sometimes his dad and his nanny get a pass at his affection too. What do you guys think ? am i over reacting ? is it mum guilt or is he actually reacting to sleeping separate from me? 😭 i told my husband we have to let him sleep with us again and he didn’t like the idea. the new found freedom is too good can’t lie but i just can’t help but be worried.