I don't want to spend the rest of my life with my boyfriend. Should I break up with him?

I’ve been with my boyfriend for a little over four months. I had been reluctant to commit to him in the beginning, as I had just gotten out of a difficult relationship and wanted to be single for a while. He persisted, and I did eventually fall for him. We’ve had amazing times together, and fantastic sex, but I don’t love him as much as I want to. He tells me he loves me all the time, and that he’s so happy to have me. I know I don’t want to spend the rest of my life with him, and that we’ll probably break up after I leave the country early next year.

I’ve asked him “what if I can’t be with you forever?” and he said “but I want you forever”. I want to go back to my home country and he wants to stay where we are now. I don’t want a long-distance relationship (I’d been through that).

The thing is that we’re going to have to keep seeing each other around after we break up as we go out dancing (salsa) a lot. Even if I stopped going out to dance (which might be the case as he is the one who drives me places; it’s neither safe nor convenient for me to travel by public transport) we have to dance together as we’ll be performing at the end of January. If I don’t keep social dancing to practice, it won’t be good for the performance.

We’re also going for a cruise together at the end of the year (which has been booked and paid for and is not a cheap holiday) and sharing a room is not going to help having “no contact”.

I don’t want to lead him on to think that we’re going to have a life together but at the same time having to still be in contact with him won’t help either of us heal if we break up now.

To further complicate things I’ve developed an attraction for another guy; I don’t know if the feeling is mutual, but I’ve been thinking of him more than I should be. I feel guilty; I’ve never cheated on anyone and I definitely do not want to start, but I already feel like I’m being unfaithful for thinking about this other guy. I think it’s a fleeting crush and I’m hardly leaving my boyfriend for him or banking all my hopes on this new guy now, but it just makes matters worse and confuses me further.

What do I do?