<human>: Me and, we'll call him Pete, have been dating for six months. One of the things we said when it started was we both wanted to go slow (life situations and history of bad relationships for both of us).

At this point, we've had a pretty steady routine of hanging out on the weekends from Saturday-Monday morning. He calls me everyday after work, then again at a minimum before bed, sometimes he'll call at another point in the evening as well. We go out, he's talked about me to people at work and his family, and at this point I've been invited to a NYE get trip with his brothers and their SO's.

That sounds great, right?

The last few weeks, he's been skipping the after work call on a increasingly routine basis. I didn't think anything of it, but this week it has been three days out of the four so far. That is atypical. 

Over Labor Day weekend, he went home to see family and all was well. The next weekend, he had to work one day then had planned golf and supper with a friend on Sunday, so we skipped our usual get together. That was fine as well. When I saw him this past Saturday, we gave each other a few kisses and a big hug and I said, in a cutesy tone not all serious "I missed you!" He responded with "You did? Why?" In a cutesy tone back, but never reciprocated. 

And... About a month ago when he was in the shower, he got two texts back to back from a female high school ex of his he had previously told me was trying to get back together with him but he had shut her down. I didn't read it. His phone was on the arm of the couch where I was sitting, I just saw the preview on his phone screen, then moved it to the table away from me.

I just texted him, an hour and. A half after he normally calls and I've gotten no response yet. 

I intend to ask him if he's seeing/talking to someone else, and I believe I have a right to inquire. But am I overreacting?

Could you distill the essence of the text into 1-3 sentences?
<bot>: SO has stopped calling at his normal times and its throwing red flags in my face. Would it be out of line to ask him if something has taken his interest away?