Basically that really.
We have been together just over a year. He slept with a girl 3-4 years ago, hasn't seen her in about 2 years. she is incredibly beautiful - that's not the problem. it is that is all seems secretive. They talk occasionally. I've never had a problem with it really. But he's meeting her tomorrow evening for a drink. I've met all his other friends (guys and girls; group of friends) yet he hasn't invited me to go with him tomorrow and he's arranged it for an evening he knows I'm not free.
We went for a walk earlier and I spoke to him about it. I asked questions, I didn't say I was upset but it's very obvious I am, and why. I haven't spoken to him since. He's been very quiet, when usually, he'd say something like im being ridiculous or overthinking etc.
I think a big part of the reason I am worried about this is that in May, he was working away from home. He went out, got drunk and ended up sharing a hotel room with a female colleague. Next day I asked how his night was. He lied to me. Told me he went back to his hotel. I knew he was lying but he didn't know that, and got upset I didn't believe his lie. I later called him out on it and he was very remorseful and we have 'rebuilt trust'. However, clearly not as much as I'd thought, as I now do not trust him meeting this girl.
My gut is telling me something is wrong. We love each other, but he's made a mistake before and actually didn't seem to understand how he crossed a boundary, so what is stopping him from doing it again.
Is this all in my head or am I right for having concerns?