Was I always just his back up option?

Me and this guy at work have been flirting for a while, it got to the point where even though I was going on a few dates here and there they weren't working out because I had realised that I like this guy at work. I also got the vibe that he liked me, he was always asking if I was single, if I was seeing anyone, liked my new profile picetc but because nothing really happened I didn't want to push something as I didn't want it to be awkward at work.

We had one shift after work where we were flirting more than usual and I got a good vibe so i thought that next time I was working with him, I would broach the subject of going for a drink just us or something. However, in the space of a week his ex girlfriend had come back home (she works abroad) and they were very obviously hooking up again and then ended up trying their relationship again. This was all fine to me, but whenever she was at the pub or her parents were, this guy started to kind of avoid me, he would keep his distance from me and wouldn't really speak to me much unless she wasn’t around

This has just madethink that, he was only after me for a shag and wasn't really that interested in me other than that due to the ex still being in the picture. At first I thought it was because he was the manager and we worked together and because thats why I was holding back I thought maybe thats why he was as well.

However knowing now that him and his ex were hooking up whenever she came back home (i think she came back every few months between (July - Dec) and that he went out to Spain to see her before she was away for a few weeks, makes me think that I was just a back up option when he was horny/bored.

I think I just happened to start working there at the time they had split up the first time and because I was single he was trying for a re bound shag.

Was I always just his back up option?
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