is there any hope for this relationship?

I started dating a guy about 6 month ago. we hung out every chance we got and had a great time and grew very close. he introduced me to his family and friends and i did the same. Later I discovered he had not cleanly broken up with his ex, even tho they were not talking anymore (they seemed to have stopped talking about 9 weeks before him and i started dating). To date though, his twitter profile picture is a pic of him and her. I asked him about her when we were 2 month into the relationship, he said she meant nothing and he would change the twitter picture. three month into our relationship he went to work in another continent for a few month. so we basically switched to whatsapp texting as our main source of communication. we were texting each other constantly, day and night. we kept each other posted on our lives, and even helped each other make big decisions. 5 month into the relationship the twitter picture hadn't been removed, so i asked him again about him and his ex and he said he would remove the picture. he then quickly changed the subject. after that he went cold on me, not texting at all. 2 days later i texted him asking if he wanted us to continue dating and he said he did, he had just been busy. after that he was texting me as we normally did, but i was cold to him, giving him one word answers and replying his messages hours later. this went on for a week. then we spoke about it, i apologised and told him the twitter prof pic was really making me uncomfortable. he said he would change it and the ex meant nothing to him. he re affirmed his love for me, claiming it would never change. i told him the same. the next day we texted general stuff, like all was ok. then suddenly after that he stopped replying my texts yet he was evidently online. i then stopped texting him too. so basically its been 2 weeks since we have had a decent conversation. he texts me once every 3 days saying hi. but i dont reply him at all. i really like this guy, we have had a great relationship, with so much meaning. but i don't understand his 'ignoring acts' and the fact that the ex is still on his twitter profile picture. do you think i have any future with this guy or should i just leave him to wallow in his confusion of whether he wants me or his ex?