Having a wobble

Recently gone through a break up and I've been doing OK. It was a toxic relationship and he was abusive in many ways. But I loved that guy soooo much and probably always will. I wish I didn't but I do. Like I said I've been dealing with it OK but today I'm struggling. We were together for a very long time and I think I just miss the good times, which gets me thinking of our happy memories 😥 how the hell do I stop this and get back to being happy? I think I'm just worried that I'll never find anyone else, because I'm 39 years old and time is ticking idk