His habits annoy me

Have just moved in with new partner, having left family and friends behind. I have 2 kids, he has 2. His kids visit every other weekend. Had a long-distance relationship for 2 and half years before making commitment. Trouble is, now I've made that commitment and we live together I am finding our relationship is not going so well. My partner tells stupid jokes all the time - when we only saw each occasionally it was kind of funny, but now, 24/7 its annoying. They are not even funny, just plain stupid. Kind of things a 6 year old would laugh at. Incidentally, my 2 kids don't laugh at him much either and neither do his own kids! I just feel he needs almost constant attention. If nobody is paying him any, he starts singing really loudly and doing stupid dances in front of tv when kids are watching something. Or if I am trying to talk to him about something serious, like finances, etc., he starts dancing and laughing at himself. He laughs at his own jokes, ribs himself, and likes to act like a complete nerd, and almost loves the fact that he is a bit of a nerd. If anyone remotely funny comes on the tv, he says "that's me!" Its almost as if he is constantly aware of himself, as if everything is about him! What is this? I am beginning to feel like I am living with another child not a man. He has a very responsible job and works very hard 10 hours a day. However, whilst he spends all day handling other people's issues, his own past is a complete mess - debt, nightmare of an ex-wife, rude son, and he handles these by getting really stressed to point of being incapable of handling them. Any help is appreciated.

Well, the answer to this question is within your statement. If you says he has a responsible job, debt, nightmare of an ex-wife, a rude son, and he handles all of it by getting really stressed to the point of being incapable of handling them. This is probably how he handles all that is going on in his life and this may be his way of screaming out for help. It may be annoying but I recommend that you take him to the side and mention what you're saying. Tell him in a subtle way that what he's doing is annoying you and the kids but let him know that he can always come to you if something is bothering him that he can always come to you and talk about it. That you'll do whatever you have to do to relieve his stress but he can't act out for attention like a child.