Advice on contacting ex?

don't contact him. try to go on dates again he'll get out of your mind. but from my point of view he still might have feelings for you. but he's also confused because he's still with her. and he called you after a week which shows he still care about you, even thought it seems hard to believe the "car problems" was his way of reaching to you to see you.don't contact him let him make the first move and if he does don't accept right away it would be too easy for him. in the mean time occupy yourself i know it must be hard for you to stop thinking about him but be brave it's gonna be alright ok.and don't do anything for his bday he's feel your absence this way.