Rushing or rebound

hi , i was with my ex for 6years with have 2kids , now 4months ago i finishd it as i wernt well and he keept pushing me ! so we broke up with 4days he was txting his ex from 7years ago i only found out because he was ignorning his daughter !! 3weeks he took out kids to meet her (but they both didt know they was going and went out that same day ) 3months into they r engaged and looking at venues , YES IT HAS NOTHINK TO DO WITH ME but they r rushing my kids into as ive let him have kids and take them to hers to sleep then next week hes taking them hia mums , hes stopd paying for his kids , has not seen them in 6weeks , and havibg lies put up on fb about me like "im useing kids agest him (but went to see solictor to made sore he had them ) im sad because he wants nothink to do with me ( err i finishd him) , and hes bought a car id neva let him have !! and even took her and her 2kids on hoilday ,

Talk to him about how you feel and what you've been thinking about. Then see if he's willing to work something out with you. If not, let him go and find a solution that works best for you, him, and your children. Communication is key. Take care.