Bad Day

I am so tired of my ex. Me and him have a daughter together and I swear he is bipolar. One day he's nice one day the worst. I don't hear from him for 6 months then he starts texting me. Mostly he;s asking for pics of his daughter so whatever I don't mind that. Then all of a sudden today, I don't know if he just snapped of what, but he starts telling me all these lies and some truthful things about my bf I'm with now that of course I already know. He is intentionally trying to ruin my happy relationship by trying to scare me and just plane piss me off. Saying things like I know he cheated on you and forgave him which is absurd! That never happened I don't know where he is getting his information from. Then he is all he cheated on you when he was camping and the ONLY time my bf has gone camping in our entire relationship has been with ME, and we live together so I think would know if he disappeared for even a night. So ridiculous! I finally had to block his number, I partially feel bad since we have a daughter together but I can't handle his childish behavior and stupid lies. I'm done with him trying to ruin my life.