Am I bugging? Or should I legitimately be concerned?

So I started talking to this guy back in July. We went on two dates, but were really speaking over text. One date was in August and the other was in December. My friend had set us up on the second date because I wasn’t sure if he liked me that way, but he basically admitted that he did. He’s in the military, so we couldn’t speak over text or anything while he was training, but after our second date, he told me that he’d write me. He told me that in January, and I still haven’t gotten anything. I understand that he’s busy, and mail travel is difficult, but earlier today I was scrolling through Twitter and he popped up under suggested. I went onto it and saw that he’s been liking pictures of different girls, and he posted yesterday. I dont know if I’m overthinking, but I’d rather have him tell me that he’s not interested than to waste my time, my heart and take up space in my mind. Seriously, am I being stupid??