Worried about regrets

Help please

I have been with my husband 15 years & married for 8.

We have a 4 year old and 11 month old.

I don’t love him romantically anymore and this last year especially our relationship hasn’t been great and he even moved in with his mum for a while. It’s been 5/6 months but nothing has changed.

When I try to tell him the things that make me unhappy we go round in circles and it feels pointless even trying anymore.

He is a really good person and when we aren’t arguing things are very civil and amicable. But when we argue it all blows up & it can even be over little things.

I just don’t want him to stay and us end up hating each other, I want us both to have the opportunity at finding love and being happy, not just staying together for the kids but I also worry I’ll never find anyone else that is as good to me or that I’ll end up lonely.

I worry in years to come I’ll feel I threw things away and only look back on the good times/memories. I keep waiting for the last straw to be sure it’s the end but I don’t know that there is going to be a major sign.

Please help me.