Bezi
You MUST go on holiday with him, make him realise your still fun. I know having a lo can take the edge off of a youthfull look on life IYSWIM. Show him what he would be missing should he play the game that others have described here.
As you know my other half is a drinker too, stays out all night the same as yours. Tells me he will be home and sometimes he does, sometimes he doesnt - depends how greedy and drunk he gets.
I made it clear with him in the early days i wasnt going to be treated like a little wifey sitting at home with the dc, kept in my place and putting up with any bollocks like what your dp is trying on.
My dp is 38, yours is still young and he obviously feels he needs to live an adolescent type life. He is going to miss that, i think thats just natural. My dp doesnt feel like that anymore.
I have threatened to leave him from a couple of times but that was a long time ago now. He took my threat very seriously (although at the time i secretly didnt know how on earth i could of done it) he bucked up his ideas and now i only really have to put up with this type of thing once or twice a month (alot more often if footy is on, England games anyway).
He knows where there has been a line drawn. I dont mind him going out, but i want to know when he is going like a good 24hours notice, infact he asks if its ok! I also dont stand for him bringing mates back unless i say so - that really used to freakin do my nut! One minute nice quiet organised house next minute its turned into a bar, loud, smokey and annoying. Again, i dont mind sometimes if im in the mood and if its the right mates.
Relationships are about give and take and trust. At the moment he is taking the piss. Set the boundaries, tell him exactly what you expect and can agree to.
With regards to his lie. I wouldnt be able to let it go until i knew where he was all night! Force it out of him, you have a right to know! My dp has never done this but a friend of ours does it to his dp (who is also a friend of mine) and i know for a fact he has had other long term relationships and one night stands during their relationship. She (his dp, my friend) hasnt got a clue! Dont let yourself become like her. How bad is she going to feel knowing that we all know and have known for years! They have 2dds too, 8&3! He is 26, she is 25.
Stop him in his tracks now. You MUST! Not only for you but for your ds too. Otherwise you be living a lie.
Tell him you want some answers, and you will go on holiday with him and treat it like a make or break situation. Either you get on and agree to try harder, or you split after the holiday.