Am I overthinking this?

Before you read this.. I KNOW I sound like an absolute psycho so please don't be mean. I already know he can do better than to be with someone so insecure..

To put some context to this, I have always questioned why my husband is with me because I don't feel like I am good enough for him. There is always some doubt in my mind which is why I am asking this.

We have a 2 month old baby and have recently been travelling into the city for his work every 2-3 weeks. I go with him so I am not alone with the baby and it gives us a chance to see family. About a month ago I saw on his phone that he had messaged a random (BEAUTIFUL) girl on IG "heyy x". I asked him about it and he said something about her saying on her tiktok to message her on IG if you want more tiktok followers.. this sounds super suspicious to me because well.. why?

The last time we were in the city he went out with his friends. Now the only reason I find this suspicious is because he never does.. he prefers we go out and see the friends we both know so we don't leave each other. He went out at night (another odd thing he doesn't ever do) and didn't post anything on any socials (this is VERRRRYYYY odd for him). I didn't say anything..

He came home and he now says he wants to make that a regular thing. I said I didn't mind it on occasion but that I rely on him in the evenings and weekends to help me with the baby as I too need a break, and I have not had one since the baby was born.

We are planning to come here for his work next month and his work has booked US a hotel close to the office and he keeps trying to convince me I will be more comfortable alone at my mums house (mum lives in the States and us in the UK but her house is currently vacant). He is trying everything in his power to convince me ill be better off there when it doesn't make sense to me. We have since decided I will stay with him up until the last night, where he will stay alone there because he will check us out that morning (not sure why we can't just check out the night before and both stay at mums house)..

We are currently in the city and he called me saying he's working late. This happens sometimes but the reason I find this suspicious is because he usually has a whole story to tell me when he comes home from working late. This time he didn't and has been reluctant to even speak of his day.. he usually messages me from his work computer but today he was messaging me from his phone (please don't ask how I know this because I already sound like an absolute psycho and don't want to make it worse). He also was going on about how desperately he needs a shower.. when I told him the shower isn't working, he said he would have a sink shower and at the risk of making him sound nasty he has never done that before as he doesn't care, he could go over a week without bathing so why was it so important to today?

UGH, I'm just so insecure.. I feel like I'm going crazy. If you do think I am overthinking this (which I'm sure all of you do) please give me advice as to how to overcome these doubts.. I don't want to feel like this.