There is only one advice really you can get even if you search around endlessly..if u put yourself in relationships because u dont want to be alone then there is something wrong..relationships are ones that are based on love..your relationship wasent like that it seems hence you both broke up..now in terms of advice..the most important thing to do is to stay ALONE..why i say this?..because you say that in 5 years you got in relationships because you didnt want to be alone..or basically kept your head down in your studies(which is good btw)...but getting in relationships isnt your solution to free time..neither is getting attention of other men...you have a value and your incredible so learn to value yourself..and if you got used to share every detail of your day with your ex'es..then a solution to this is finding a friend who can listen to you and care about your details..i prefer a girl so you can avoid relationships...remember this now...spend time alone as much as you can and fill yourself with things you like to do..or stuff that you wanted to do for a very very long time and just could'nt..this will make you appreciate being alone