<human>: I'm 26/f he's 25.  We've been dating for a month and see eachother frequently/spend the night.  We met on OkCupid and he disabled his account soon after, but I told him I wasn't going to do the same.  (He since re-activated it when we hadn't seen eachother for a few days and he thought I wasn't that interested.)  I've told him I want to take things slow, not rush into anything serious, etc.  Last night, I was on a date with this other guy I've been seeing for about a month also (less frequently as he lives all the way in Long Beach, I'm in LA.)  Main guy was texting me, asking where I was.  I said a party in Hollywood, which was true, and put my phone away to not be rude.  Woke up this morning and main guy had texted a few more times asking if he could come over later, etc.  He also looked and saw I had signed-in to OkCupid this morning (phone always does that automatically upon opening internet explorer). Well, now he's mad at me/wanting his watch back which he left at my place a few weeks ago, being very short.  I asked if he was mad about me not responding/said I didn't want to be rude at the party.  He said, "haha nice one.  we need to talk about it in-person, not a suitable convo for text."  So I think he's doing to break-up with me. 

What should I tell him?  I'd really like to keep seeing him, as I like him very much.  I don't feel like I've done anything wrong here.

Provide a brief overview of the text.
<bot>: Guy I'm dating has figured out I'm seeing other people and is mad/going to breakup, although I told him I was going to remain on OkC and didn't want to rush into things.