There are definitely some people who constantly feel the need to be in a relationship. Sometimes they don’t even do it on purpose. The only problem with this is you’re not giving yourself time to reflect on the last relationship. A month or two is not nearly enough time to reflect on a two year relationship.
There are reasons the last one didn’t work and if you don’t stop to figure out what those are you will make the same mistakes in your next relationship. Sometimes you are the one to blame and you need to accept that. Those same habits that are causing relationship after relationship to not workout will ruin any chance you have at making a good relationship work.
Being afraid of being alone is probably the worst reason to be in a relationship. The chances of you getting tired of that person will drastically increase because at the beginning of the relationship you are always given way more attention then normal. Then, once you get into a routine and the amount of attention you receive decreases, you don’t know what to do. You have to be happy by yourself before you can really be happy in a long term relationship.
If you can’t be happy with yourself, how can you expect someone else to be?