New man

Carry on living your life, as your sons live theirs.
Keep your new man away from them if they aren't adult enough to be civil.

I've had a new man for several months and although the family know about him there have been no introductions, the difficult period is going to be Christmas. I have no desire to cause any bad feeling so I am going to see who invites him, then once the ice is broken it will be OK.
The real crunch will come if you get married then inheritance becomes an issue, if there is any property involved no reassurance from you will satisfy your sons. Moving in with him will confirm their fears, so be aware there is a big risk of a permanent rift in the family. If you do have a house keep it and rent it out, that at least gives your sons some reassurance

Hi goodynanny, this is my take on it: don't let your sons lay a guilt trip on you. Tell them that they should be delighted that you have company. Perhaps also add that they are letting you down by their behaviour. Assure them that you love them all the same! ?

Best wishes for your new relationship.

Can you tell your sons that you are lonely and you feel happy again whilst with your new partner ?

Are they worried about losing an inheritance if you end up marrying this man? This happened to my SIL.

Your sons surely have their own lives and don't rely on you for a social life.
They should not be so harsh because you have a life too.
Therefore they should appreciate that you need to develop your own friends and even a new partner or husband.
Maybe keep everyone separate and enjoy your relationship with each rather than try and get them all together.
Your sons are entitled to their opinions but should not want to make you unhappy or guilty.
Keep with this man and enjoy the good fortune of another decent relationship.

So sad you feel guilty your not doing anything wrong. You deserve friends. They have their lives and you yours. Maybe it will take time for them to realize it. In the meantime enjoy your relationship.