Weird situation... is cutting him off the right thing to do?

Anonymous
Ok, I am in the strangest living situation which I really can't get out of unless I decide to become homeless. I moved to another country last year to attend university near my ex (we were on a break when I came). I have been living with his parents for free and have sort of become a member of the family. My ex has his own place and I only see him on the weekends.

Anyway, when I came here we were on a break because we were living long distance and were going to talk about getting back together when I moved. We never did, instead we just slept together and I assumed we were back on. But to he told all his friends we were broken up and was looking for someone new while still sleeping with me. Anyway, he met her about 8 months ago and dumped me. He lied about being with her, but I always knew and eventually he confessed it when I showed him hard proof he couldn't deny.

I still stay with his family because I can't afford my own place and stay in his room. A couple months after dumping me, things didn't work out with this girl and he started sleeping with me again. At first I still wanted to get back together, but later saw that he didn't want a relationship from me, only sex. I keep trying to get out of this situation but I can't avoid him and he knows how to seduce me.

Anyway, I still have issues with him and about this other girl. I am so angry with him for what he did, but he doesn't think he did anything wrong. I am so angry at myself for getting myself into this mess and not measuring up to this other girl. He has been really great to me, letting me into his home and all and we were close (I am slowly distancing myself emotionally) but being around him I keep remembering that I am just his constellation prize and really he wants someone else.

I am going home next week for a visit and will be gone for 2 weeks. He was here over the weekend but left today. I haven't spoken too him since he left and was planning on just staying offline for the next few weeks until I come back.

After we broke up I managed to avoid him for 1 month (but when the other girl dumped him, he came looking for me). It really helped me to heal but is there any point in doing it again? I will have to see him again in 3 weeks. Is it rude to just cut him off without warning for 3 weeks after everything? Do you think he will even care that I don't talk to him for so long? I have done the no contact thing before, but every time we end up sleeping together.
Weird situation... is cutting him off the right thing to do?
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