If i get pulled to contact someone i always do. i don't think one contact will change anything on a grand scale.
I agree contact doesn't change anything.. if the person is not into me then he is just not and few text exchanges won't make him commit to me.. all the psychics who told me there will be contact were right because there was contact but it was so pointless..just cursory greetings and that's about it.. also I think it depends at which stage you are in your life, if you are young, want to wait around, try things around then it's a different story, but if your intention is to find a life partner then ask yourself do you really want this guy? Sorry to go off tangent but just a thought. Like for me I think if my guy is not coming with an engagement ring then I don't want to see his face LOL.. because I am not going to fool around anymore at this stage in my life. Five years back when I was 25 I was all about that not anymore.
Also, if I intuitively feel that I should contact a guy then I will, it's almost like if you are being guided then do it but if it's with a hidden agenda and ego based decision then I usually stop myself because then that's when you are trying to force things and your needy energy can push someone away..
You were with him for 3 months, you owe an explanation or at least one last message where you tell him how hurt you are by his behavior but if this is what he wants then you wish him well!