When I lost my relationship with my first girlfriend after 3 years (She was 11 years older than me), I for running away from that experience started a relationship with another girl quickly. During that time a lot of my thoughts were still stuck in my past relationship. So I could not decide well if that new girl was the right choice or not. I was sad, angry and scared of being alone. So I lost my capable of deciding well and logically.
As you can imagine the second relationship was even worse and destroyed me even more.
I think this is better to have some months between relationships. I tried to have it and I find my third decision better with it (But however I lost it… for other reasons)
Maybe it is a good idea to try to making friends and being in social rounds actively and maybe there you could find the right person when your mood is good. I’m trying to have it now (But I’m not really successful in making friends now…) But however, I find this the best solution.