What should I do?

[MummytoHarryandAlfie]

Hi everyone, I've been in new relationship since feb 2019 after leaving my ex husband due to infidelity on his part.
Since starting my new relationship my dad has had a vendetta against me being happy and my OH. Making up lies which could have a major impact on our lives should police or social services get involved. There are all 100% lies but as much as I try to maintain a relationship with him for my childrens sake he continues to lie. What should I do, recently I told him I didn't want anything to do with him and not to contact me. Then he comes round to see the children (through the window due to covid-19) acting like everything is ok.
Do i block his number and move away (as he lives over the road) ??
Its putting a strain on our relationship (OH) and I really want it to work between us but the toxicity of my dad could ruin it.

Please help !!
I'm finding it hard to know what to do because I'm a kind person and I feel awful for thinking this way but my happiness is much more important.

I know its very hard as its family but you have to set clear boundaries and stick to them, also be prepared for him to try and push through them. I was in the same situation with my mum after my divorce where she was very critical of me making up lies. Through lots of counselling i learned i had to free myself as she was making my life so hard (she was minimising my husband's abuse to all she spoke to because she stayed with my abusive dad i thought i didnt deserve better) . It was hard and now i barely see my mum but it was necessary as its hard enough divorcing but even harder doing it with criticism. Free yourself is my advice draw a final line point/day