He only reaches out when he wants sex.
Sure, sex is an important part of any relationship, but a long-term relationship is built on so much more. If you find the only time that he contacts you or puts much effort into your relationship is in order to get laid this may be a good sign that it’s time to move on. (Unless, of course, that’s all you are looking for, which is totally OK too!)
He doesn’t focus on your wellbeing.
Being in a relationship together means caring deeply for one another. You want so badly to see one another happy that it just comes naturally to be concerned for your partner. If you feel as though this isn’t happening, it could be that your partner isn’t focused on thinking about you at all.
You feel as though there is a distance between you.
An important part of any relationship is the ability to connect and communicate with one another. If you feel as though you are a stranger when you are around him, unable to bridge that gap, it’s not a good sign!
His days are spent with his friends instead of you.
We’ve all met that couple that completely gave up every aspect of their personal lives apart from one another, including their friends, for this new ‘us’. While that isn’t healthy, neither is someone who doesn’t want to spend time with you, spending it all with their friends instead.
(H/T : Evome )