Is it me or is there more to it?

Now I’ve never been someone who can trust people. Any person - my mum, dad, best friend, anyone! I just can not trust anyone 100%. I have been like this for as long as I can remember. I trust myself 1000% though!

Been with partner over 4years and had a baby last year. Prior to baby I never doubted my man and could honestly say I trusted him a good 98%. I would still snoop a little at his social media activity (don’t even know what I was looking for just keeping an eye out) anyway since baby has come along everything has changed!

I literally go out of my way to dig and find things to see if he is cheating. I constantly check everything I can think of even his phone.

I know I have changed physically (I put on 4stone), I know being on maternity leave, leaves me home alone a lot and I know the constantly lack of sleep is rapidly sending me stir crazy but I am forever trying to find something.

I found out he has the neighbour (some girl) as a friend on Facebook now (he would of had to look and search for her cos his account isn’t under his name- he don’t have me as a friend on it) I then sit winding myself up wondering why he did that. I then cause a row. After I feel silly but a day or two later I’m doing it again and delving deeper.

He says I want to cause a row he says I go out of my way to cause issues. I think sometimes he does things knowing I will react, sometimes I think I’m crazy other days I think no it’s not me it’s him he in the wrong

Advice please